Rockstar gives a non-legally binding blessing to GTA roleplay servers, but takes a hard stance against NFTs.
GTA Online

At the trail end of last week, Rockstar Games issued a clarifying statement on what they feel is and is not permitted on GTA Online roleplay (RP) servers.

As part of their remarks, Rockstar seems to have given their blessing for those popular third-party roleplay servers to keep existing within GTA Online. It is in these servers where people "roleplay" different lives, be they lives of eccentric citizens, perhaps even taxi drivers, or even RP'ing as the police.

Rockstar hasn't exactly give players carte blanche with their verbal seal of approval though. The developer specifically cites a few things that are not permitted to take place on these RP servers. The things that aren't permitted are being limited by Rockstar's parent company, Take-Two Interactive and their legal team.

Of those things that are not permitted are the use of "cryptocurrencies or crypto assets (e.g. 'NFTs')". Rockstar says that other things that are not permitted on these RP servers include stuff like misusing Rockstar IPs, no selling of "loot boxes" for real money, and not screwing around with official multiplayer services from Rockstar.

Rockstar Games has always believed in reasonable fan creativity and wants creators to showcase their passion for our games. Third party “Roleplay” servers are an extension of the rich array of community-created experiences within Grand Theft Auto that we hope will continue to thrive in a safe and friendly way for many years to come.

As such, Take-Two’s legal enforcement policy will be aligned with our current PC Single-Player mods policy, with priority in enforcement actions focused on: (i) misuse of Rockstar Games trademarks or game intellectual property (IP); (ii) importation or misuse of other IP in the project, including other Rockstar IP, real-world brands, characters, trademarks or music; (iii) commercial exploitation, including the sale of “loot boxes” for real-world currency or its in-game equivalent, the sale of virtual currencies, generating revenue via corporate sponsorships or in-game integrations, or the use of cryptocurrencies or crypto assets (e.g. “NFTs”); (iv) making new games, stories, missions, or maps; or (v) interfering with our official multiplayer or online services, including Grand Theft Auto Online and Red Dead Online.​
The studio also made it clear that this statement from them "is not a license" nor does it "constitute endorsement, approval, or authorization of any third-party project." So, while Rockstar is giving their non-legally binding approval for GTA Online RP servers now, that could change in the future.