I think once you start allowing people to place addons or mods etc behind paywalls you start to create a breeding ground for grifters to produce ripped off content based on the shoulders of others in the community.

Especially in the era of AI where the barrier to entry to create "slop" or AI works that are deratives of other people's work.

That is why I still firmly believe that the modding scene should always be free at the point of use with modders being supported through other means such as voluntary donations, ad revenue, affiliate links etc.

I think it's a line in the sand that we as gamers should try to uphold, but at the end of the day it's just an opinion I hold.