If you're in the USA contact your state AG + Senator and present your case. Mention that Google is abusing small owners due to their ineptitude in security practices, construct the argument that makes it appear Google is squeezing small users like a mob boss/cartel.

Also before doing this save anything important that Google owns (gmail, youtube videos, anything in storage). The leaders at Google are vengeful enough to completely lock you out for challenging them.

Just this month Google shipped what I understand as hard limits in AI Studio/Gemini/whatever it's called this week. I had existing billing alerts (best you could do before IIUC), but set these new hard limits up immediately. Feels good!