Well here is my POV. We make both paid and free models. The paid models are only for FiveM and are escrow encrypted with CFX's keymaster so it's impossible to steal and resell. This means that we cannot sel these paid models to singleplayer players, and trust me there is a lot of people.
We make models for the Czech community which is notoriously known to steal, rip, dump models. They either dump your server, steal your models with the whole intention to resell them, or convert them to Roblox and resell them there. Ofcourse they got stolen in Roblox too...
We also make free models that we do not put much time and love into. We put these on LCPDFR.com. We started doing this as a way to prevent model theft. If everyone has access to basic "high quality" Czech cars there won't really be a need to buy stolen models from people.
This actually worked, but it also backfired. People started taking lightbars, liveries, wheels etc.. from our cars and they put it on other cars which they then sell. There isn't really anything we can do about this. They also started converting them to Roblox but that's another chapter...
I think that these reasons are why most people do not give out free models. Your stuff will allways get stolen unless you put it on Tebex 🤷♂️