What Niantic's terms say
Niantic's terms of service and privacy policy have 6 rated points: 0 serious, 4 bad, 2 worth knowing and 0 good. 4 apply whenever you use the site, signed in or not; 2 only once you have an account.
Whenever you use Niantic
Bad 3
This service receives your precise location through GPS coordinates
The privacy policy states that "We collect and use your device location information as you use our Services (and, if you elect to turn on background location tracking for participating Services, while you are not directly interacting with these Services), including how you move around and events that occur during in app activity or gameplay. [...] We identify your location using a variety of technologies, including GPS, the WiFi points you are accessing the Service through and mobile/cell tower triangulation."
Where it says this ↗Location data may be collected, used and/or shared
The privacy policy states that "We collect and use your device location information as you use our Services (and, if you elect to turn on background location tracking for participating Services, while you are not directly interacting with these Services), including how you move around and events that occur during in app activity or gameplay. [...] We identify your location using a variety of technologies, including GPS, the WiFi points you are accessing the Service through and mobile/cell tower triangulation." Furthermore, the privacy polica states that "We share de-identified data with third parties for performance, industry and market analysis. We may share Personal Data with our third-party publishing partners for their direct marketing purposes only if we have your express permission. We do not share Personal Data with any other third parties for their direct marketing purposes."
Where it says this ↗Your biometric data is collected
If the user consents, biometric data is collected, as stated in the privacy policy: "If you elect to turn on background activity tracking in our Services (for example Adventure Sync in Pokémon GO) we will collect your Personal Data as you use the Services as well as in the background when you do not have the Services open on your device. This includes your device location and your fitness activity data (such as Step Count, Calories Burned, and Distance Walked). [...] You can change your mind and turn off background activity tracking at any time in your device settings or in-app settings.With your permission we use your device’s health app (Apple HealthKit if you use an Apple device, or Google Fit if you use an Android device) to collect your fitness activity data: we read and/or write your fitness activity data to your device’s health app to operate background activity tracking and to ensure you get “credit” in your device’s health app for all of the walking you do while playing our games. We do not use data collected through Apple Health Kit or through Google Fit for marketing or advertising purposes. Our Services cannot read from or write to your device’s health app without your consent. You can change your mind and disable our access to any type of fitness activity data at any time in your Apple Health or Google Fit app settings on your device."
Where it says this ↗
Worth knowing 1
Spidering, crawling, or accessing the site through any automated means is not allowed
The TOS state that "In addition, you agree not to [...] attempt to access or search the Services or Content or download Content from the Services through the use of any technology or means other than those provided by Niantic or other generally available third party web browsers (including without limitation automation software, bots, spiders, crawlers, data mining tools, or hacks, tools, agents, engines, or devices of any kind)"
Where it says this ↗
If you have a Niantic account
Bad 1
Your account can be deleted or permanently suspended without prior notice and without a reason
The TOS state that "We may suspend or terminate your access to and use of the Services, at our sole discretion, at any time and without notice to you, including if (a) you fail to comply with these Terms; (b) we suspect fraud, cheating, or misuse by you of Content or Services; or (c) we suspect any other unlawful activity associated with your Account."
Where it says this ↗
Worth knowing 1
Your account can be suspended for several reasons
The TOS state that "We may suspend or terminate your access to and use of the Services, at our sole discretion, at any time and without notice to you, including if (a) you fail to comply with these Terms; (b) we suspect fraud, cheating, or misuse by you of Content or Services; or (c) we suspect any other unlawful activity associated with your Account."
Where it says this ↗
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.