exactly! and in fact, perhaps all are actually here for money - just some are more HYIP-minded (and thus employ whatever means possible and available as bots, etc) and others are less. thus it makes people "Content Indifferent", as some rightly call it.

so, regarding the main questions asked in this post:

what do you think about comment engagement on the platform and do you think it being a blockchain is making people too careful about what they write? Would it be different if it wasn't on a blockchain?

what I think is, most (or rather all) people are first of all focused on earning, Content is secondary in best case. then a lot (or majority?) of people focused only on making money - thus Content is not even in their attention / focus at all: why bother, if it is not necessary condition to be able to earn more, but rather actually distracts and takes away time which can be used to earn more? :D
(or do some other things, like "offline" / in real life - and leave the "curation" etc. to bots)
especially since System is made in such a way that it kind of "encourages" that (if not almost forces)
so, it doesn't actually matter: whether it is on blockchain or .... on some similar HYIP-like based platform where people mainly focused on money making.
and I doubt it very much or perhaps even rather sure that most do not worry or fear of anything - they simply don't give a damn. LOL

So, that's my brief answer to these questions: "business model" or "ecosystem" is made in such a way that it attracts people with HYIP mentality and / or enthuses them to be more minded so.
(here is in a bit more details)