I'm confused with one moment regarding GCP. So, i have different AppScript projects on different google accounts and i want to link them to single GCP project (on organization level) to be able to see logs in single place (followed this description). Everything work fine, but i don't understand now if it will affect quota somehow. From my understanding quota described here is per user, but i just worry that i missed something and because of the linked GCP project quota will be splitted between all appscript project. I would appreciate any help and advice related to this question)
I don't think there's any limit to read/write operations for sheets using apps script, there's nothing about it in quotas and it doesn't make much sense.
There are quotas if you use Sheets Api via http https://developers.google.com/sheets/api/limits
but that's entirely other story, and you only need this to access sheets from other environments(nodejs,php,python etc)
If you're using apps script I believe you're only limited by script runtime and total trigger runtime, which are counted per-script.