I've seen lots of attempts to market on Lemmy. Most get called out as spam and shut down quickly, but there's also exhalting of YouTubers and other influencers who in turn shill stuff like crazy.

Also the gaming subs are really bad for this because posting trailers and announcements about games seems to be viewed by some as a way of "padding" Lemmy with content, so as to make it not feel so empty here. If you ask me, we should welcome the emptiness, only posting about things we actually want to talk about. People who post dozens of game trailers, announcements, and patch notes are just flooding the feeds with things that may matter to nobody.