The only thing this petition can achieve is maybe getting a few people to move their donations to projects such as PieFed.
Beside that... Well, Nutomic and Dessalines are the two people who decide on how to act regarding this petition – if they should remove themselves or not. I find it unlikely that they will look at the finished petition and go "oh, people want us gone. Okay, we'll do that".
But yeah: Do not give money to Lemmy. There are other projects that are compatible with Lemmy and have use for your money as well, without being assholes :)
Maybe @jsonarray@utter.online can say? :)
(Though, I'm not sure if they read their Mastodon anymore. But maybe yes?)