Just look at the shenanigans Meta pulled in Brazil election.

It doesn’t help that Zuckerberg is recorded pledging his loyalty to Trump.

I assume it probably happens to right-wing candidates as well but I won’t hear about it on this website.

Isn't the more likely reason due to suspicious bot activity? I doubt a trillion dollar org cares much about these small candidates.

I don't rule it out entirely. In 2021 we saw a coordinated deplatforming of a sitting president across practically every social media platform. But this seems too low stakes