Dunno what's so much buzz all the time about that stuff involving people selling something. I did some mods/music stuff (this is my main niche) too, but I always keep in mind that this is internet and if I upload something then people can share it further sometimes asking for money, sometimes for free etc. If there are strict rules in your country permitting such stuff or if scammers are violating individual rules written for every platform (ebay, amazon, etc etc) then just use police or appeal to the admin stuff on these platforms, but I don't see much point in doing anything more than that like moaning about scammers. I deal with it in the way that I share all my stuff for free (at least for now), when I'm going to sell my stuff, then I'll chose platform that my rights (musical stuff is easier this way, I know - modding the obsolete games is much more vague thing to cover in terms of the law). Btw, that's why people selling music are using the most common ways to do so like itunes, apple music, bandcamp etc etc.
Anyway, I highly doubt that there is any significant amount of people buying the same stuff that they can download for free. If buying something is easiest way for people willing to gather what they need and there was a person who compiled a mod for those faster than anyone else... Well, you can't blame any of them much, I think. Well, technically you can, but it's just useless moaning if you can't do anything more than spreading your disappointment.
Moreover, I deal with my personal data this way as well - if I'm using a messenger and I share something even very intimate and so to the closest friends or even to random people - I always keep in mind that all I share theoretically can be spreaded around further and that's why if I want to keep something private I rather ask the other person to keep that thing in secret (and if he spread it around w/o my permission then he is a bad person and I can blame him and be disappointed but I cant sue him - at least in Russia this works this way) or just dont share what I dont want to be shared in the first place.
These were my
dunno_how_to_count_how_many_in_terms_if_that_was_any_useful cents. Sorry if you'll find this one to be disagreed with, but I just saw too many of these to keep on ignoring this my_stuff_is_on_the_sales_again matter on and on again,
Cheerio
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For a list of EVERY download for GP4, look here:[docs.google.com]