It is not currently safe to play Grand Theft Auto V on PC, thanks to an exploit that allows hackers to execute code remotely and modify other players' PC files. While Rockstar is aware of this issue, it has yet to be fixed as of writing.
This exploit came to light late last week, with the full extent of its danger shared online over the weekend. Those affected have had their GTA V account “corrupted”, although the risks could become far more severe. This doesn’t just apply to GTA Online either, those who stick to the story mode are also at risk.
For an idea of what your account getting corrupted actually means, the video linked below shows a player stuck in the top-down loading screen when attempting to go online. You’ll be stuck like this indefinitely, soft locking your account. You can apparently fix this from deleting your Rockstar Games folder from your documents, but even so, it’s best to say clear.