Did you actually read the “controversy” section?

A malicious adware media player - not related to Tampermonkey - installed Tampermonkey on your device to do bad stuff. And they could have done the same with any other userscript extension, like the suggested Violentmonkey. The wiki section even states:

This does not mean that Tampermonkey is malicious, but rather that a malicious program is utilizing a legitimate program for bad behavior

It’s fine to advocate and promote open source software, but why do that with lies and slander?

Return to office has made me quit.