Because its not all eggs. As you can see, they used a ton of google services, but only substituted a few with Proton. Ex. Google keep -> Joplin, Google Maps -> Magic maps. So saying that they put everything into proton is not true. It takes time to be fully independent.
I am very similar to OP. Proton right now gives good services, and is a good safety net right now for me.
Having an AI understand your codebase, and potentially answering an issue, which might not be an issue is great I think.
The problem I see here is that you have no idea that a bot is answering. Why isnt there a ‘shougo-bot’ / ‘vim-helper-bot’ / whatever named bot user for it?
“Talking” to an AI should always be disclosed, everyone feels betrayed whenever they find out that a clanker is on the other side of the channel.