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Everyone should keep in mind that this is the same game whose client-update-handshake-dance largely consisted of an enormous JSON of all the updates that had ever been done to the gamestate, which then got parsed naively. This situation was recognized and patched [0] by an interested third party [1].
Not a slight against the code monkey that implemented it that way, because they surely didn't bother to think about complexity consequences when the gamestate was new and the JSON wasn't 10MB yet, but a slight on Rockstar, because the cash cow that GTA:O turned out to be deserves some fuckin' maintenance, doesn't it? Then again, the eye-popping prevalence of hax0rs in Rockstar games probably ought to signify priorities to even the most casual observer. As others in these comments observe, with what those hackers can achieve, it's not surprising to learn there's RCEs too.
[0] https://github.com/tostercx/GTAO_Booster_PoC
[1] https://nee.lv/2021/02/28/How-I-cut-GTA-Online-loading-times...