1. Mutes in Amethyst don't do what you are implying they do. They are private, known only to the user, and don't contribute to "shadowbanning". Only reports in Amethyst are used in deciding what posts to put behind a click through. This can be disabled as well if the user wants.
2. It's more likely people would just unfollow a new user making false reports against long time Nostr devs. They have trust built with years of building and community interaction. New users haven't.
3. What relays do you use? How do you know they aren't censoring you? If you really want to guarantee you don't be censored, you would run your own relay.