I’ve encountered a single instance. On a library I maintain, I recently had a PR and a series of comments added on all my outstanding issues made by a person advertising their for-pay SaaS alternative. Every problem someone had “Just try my SaaS with this connector instead…”
I hid the comments, closed the PR asking me to link it from my README, while chastising the person a little. Looking at the user’s profile/history he had done similar to many other related libraries. I reported the profile to GitHub and the whole profile was gone with all his comments and tickets in a matter of hours.
I honestly feel a little bad about that resolution, here was a person who probably put a decent chunk of time into his SaaS and just made the mistake of advertising it in an obnoxiously intrusive manner. They had legit git repos, now gone. I could have seen a younger dumber myself in their shoes, especially as I literally built the same SaaS ten years ago, using my library, and didn’t get a single person to bite.