Apparently they use coderabbit to review PRs which then they get reviewed by a human, so it's not that bad, they also have a claude.md to make AIs add a comment so then the author can see if it was AI coded or not https://github.com/degoog-org/degoog/blob/main/CLAUDE.md
So it may be safe
Edit: They also said on reddit that they do not vibe code: https://www.reddit.com/r/selfhosted/comments/1u0hq7f/degoog_is_my_take_on_a_meta_search_aggregator/