Grindr the service isn't unethical but I recall a thing about them having a lot of third party tracking. Which given the nature of the service seems to me way worse than tracking elsewhere on the internet.
I don't know anything about the current architecture or third party trackers. It's been over five years since I did any work with Grindr.
I will say that when I worked on Grindr, Joel (CEO, founder) was adamant that we would not track location history. We only stored the most recent location we received from a user.
Know anything about that or the extent of it?