There are several mods that lock the better part of their content behind patreon subscription. I will not advertise them here, if you want them use google.
I don't have a problem with paying for some cool extra content. Some of those guys are doing great work and investing a lot of time and resources in their mods.

The only problem I have with those paid mods is that they are based on monthly subscription and in the end I will give more money to modders than to developers. And it just doesn't feel right.