There's some discussion here https://discuss.ai.google.dev/t/quota-limit-for-pro-plan/130811/2

Personally I started using it 2 months ago, with the Pro plan, and the quotas were generous, but I feel they are constantly reducing them. Today I just opened Antigravity and got a message saying my weekly quota was used, even if yesterday was ok. Even the Plan descriptions are opaque about what's the usage limits.

I have been happy with Gemini (especially v2), but the unexpected quotas changes make me want to switch.