If they are all handcrafted and not stolen why not, there should be no limitation to what's available.
@Peter Boese I completely agree with you, but I'm more concerned about one particular aspect, especially regarding paid mods : licensing. RSS or VRC are good exemples of the "avoidance strategy", even quite hypocritical it is technically, more or less, legal. But that prevent the user to get a "real names and badge" add-on, which would probably be denied on an official marketplace (even if, still, legal in theory). Skinmakers could also get into trouble quite often (you can't sell a visual representation of a brand or trademark without their consent), especially for the newer stuff as it is probably way more monitored than vintage content. Same goes for tracks if they are trademarked, which is the vast majority of them.
To be able to sell those without the proper copyright agreement from the seller, at least the marketplace would need a general agreement, or contract towards those brands to certify the rights to sell, which would be near impossible to have (many, many loopholes ahead... or, way too expensive).
It could be very good news for paidmod control and restriction, compared to the ****show it is today, but also a pretty repulsive one leading to the plummeting of the offer, therefor of the users. Or Am I missing something ?
It's a really complicated subject.
I would love to have a chat with Kunos' lawyer team to learn and understand more of this.