Many repackaged versions of the "Full" launcher contain hidden cryptocurrency miners. While you play GTA V in single-player mode, your GPU and CPU are secretly mining Monero for a stranger. Symptoms include:
The risks of using a cracked launcher—malware, ransomware, identity theft, and permanent bans—far outweigh any short-term financial saving. Saving $15 is not worth losing your Steam account, your crypto wallet, or your personal files.