My flag link disappeared one day without notice or explanation, and stayed disappeared for a year or so. I continue to fear using the flag link, even when I think something should be flagged. There's no chance I'm going to vouch for something other people have flagged: I'd never have enough certainty that I'm more right than they are in your eyes. I value my ability to participate in this community too much to help moderate it under threat of punishment for doing so poorly.
Re: the replies below, the worst that can happen is not losing the vouch button, it's being silently shadowbanned for something else, when that wouldn't have happened if you hadn't put yourself on the admin's vouch review list for extra scrutiny. I already fear that happening any time I participate in one of those "what are you working on / what are your side projects" threads and include a link to my site.