I’m pretty cranky about commercial posts, although I do think there’s a big difference between someone who is an active community member sharing a pattern they are selling and someone that just posts when they’ve got something to sell. The sticker post seemed to me to fall into the second camp - posted twice (different but similar usernames), posted across many different communities, etc. Honestly I don’t know how you write rules for that, though - get out the calculator and check ratio of helpful posts to commercial? Sounds like the Reddit minimum karma for posting rules that end up prompting a bunch of generic comments just so people could get their numbers up.
I left an in-person knitting group a while back after it seemed it was just becoming a captive audience for member’s MLM sales, so maybe I’m more sensitive than most. There’s always the block button, though.