will only get them so far. Ultimately, the platforms are subject to the laws and regulations of the jurisdictions in which they operate. And as the surrender of Musk and X to the Brazilian courts shows, state power is likely to always ultimately win against the platforms if tested.
So, who watches the watchmen? In the case of social media platforms, it seems that the answer is clear: the governments and legal systems of the jurisdictions in which they operate. These entities have the ultimate power to regulate and control the platforms, and it is up to them to ensure that these platforms are held accountable for their actions. The platforms may try to resist, but in the end, they are subject to the authority of the state.