Regarding spoiling the fun, were this a world without enshitification and/or corporate malfeasance that might be a good consideration. For the world we currently actually DO live in, my initial reaction is usually one of mistrust - and I strongly suspect I'm far from alone in that.

As such, I normally might've not ventured forth with exploring your offering, but instead waited for someone to give me more of an idea what I was walking into before potentiality giving out information I didn't want to inadvertently. However, at the moment I came across your post I guess I was feeling gregarious enough (and less concerned with this identity since I've only recently created it) to toss my normal inhibitions aside, and share the kind of info I myself would have been wanting to see before taking the risk.

TL;DR: There are an number of psychological factors at play here as well as real-world concerns, so IMHO the more up-front you are in letting potential users know what to expect, the more comfortable they'll be with giving it a shot. They'll also be better informed about what to look for in features they might not have otherwise discovered with a quick spin.