Well, enshittification usually only starts after a good while. If the parent company wants changes they can slowly press forward to achieve what they want, even if they are somewhat limited - those limitations are usually limited itself. E.g. WhatsApp data was seperate to Facebook at first, but slowly but surely they became more interlinked (at least internally).

Anyway, I don't know enough about Nexus Mods and their owners to have any idea where they're headed. As you've said, there's been no indication of them doing something shitty.