Its just been my personal experience browsing, sorting by new. Generally, anything that could potentially be viewed as an ad (nonetheless a paywall) gets downvoted. For example, I used to see more art shared, and often users who included watermarks (even non-disruptive ones), or links to a patreon would be immediately downvoted. I’ve also seen YouTube creators criticized here for simply selling merch. Even just a couple days ago, I commented on the same trend, and another user quickly replied to tell me its a good thing nothing here can be monitized because money ruins everything. There are exceptions, esspecially with open source software, but these seem more the exception than the norm, in my experience.
They also often rely on commissions or supporter pages to cover costs or make a living, which Lemmy is often hostile to.
The main thing is post more. Lack of content is the main reason people don’t use Lemmy more, and the only way to fix this is to share/produce more.
Its a bit of an unpopular opinion, but I think even (transparent, community-relevant) bots are a good idea at this point, given that 99% of interests have little to no activity currently. For example, if we had bots that post game update changelogs to their relevant communities, it would at least provide a baseline amount of content and make it easier to discuss for fans of those games.