This conspiracy theory has been going for a long time on right-wing media.
It typically involves pointing to some right-wing political figure of note, like a popular blogger, who has just been banned from some social media platform. "See, it's a conspiracy! Time after time right-wing activists are being censored and silenced by the liberal media and technology firms!"
On closer investigation, the ban is found to be either an error that is swiftly corrected, or in response to the banned party posting something in clear violation of the terms of service, like a call to rise up and fight the gay oppressors, to execute illegal immigrants as enemy agents without trial.