I would not do that. The whole idea behind Tor Browser is to make users look similar. By using a custom DNS provider you stand out from the crowd, thus making yourself more unique/identifiable. A website may not be able to see who you are, but it’s gonna have a way easier time seeing that you’re the same person visiting as the person who was there yesterday.
Might be that someone is innocent, and thus didn’t read the 5th-8th amendments before going out and doing some dumb and illegal shit (read: they didn’t).