Rate limits: https://superuser.com/questions/1453258/what-could-cause-429...
Take your pick of lockout horror stories:
https://twitter.com/Demilogic/status/1358661842147692549
https://twitter.com/raveofravendale/status/13895079282693939...
Edit: Also don't forget their Maps API change that sent many developers to the wall https://imgur.com/gallery/ZuWMooq