You shouldn't trust open source software because it is open source. You should trust open source software because it has been audited, and only when it has been audited by people you trust (it may be yourself).

Whether it's vibe-coded or not doesn't change that. If it is vibe-coded and unreadable, how is it different from manually-written and unreadable? If it is vibe-coded and readable, how is it different from manually-written and readable?

Judge the code by its quality, not by its provenance.