Maybe because it's largely smaller companies, but my past experience over the last few years of these posts is that the quality of the experience with companies that post here is significantly worse than any other places I've found potential job opportunities.

The worse offender so far was one company that outsourced their interview process to a third party, gave me a take home project and didn't even bother to follow up on that before rejecting me. It was my stupidity for even agreeing to interview that didn't involve talking to anyone on the team, but the position was a uniquely good fit.

But I would generally advise people to avoid reaching out on "Who is hiring?" posts.