Lots of reddit will find themselves unwelcome in Lemmy and by various instance admins. They may make their own instances, but depending on the content that comes from them, they may even be defederated from ours.
Lemmy is community owned, community run, and community focused. There is no profit motive. There is no logic to keeping people on your instance or interacting with it who work to its detriment. Just having more people on your instance doesn't mean "one additional customer".