Let's be real here, there are big differences in what you're saying. The power company, or Apple for that matter can't know what you're using their products for. You could be smearing shit on twitter at work, or on the public wifi. There's no connection there. Whereas twitter, facebook, insta etc. the literal process is you send a message to the platform saying "Put X on you're website on my behalf".

A second big difference is facebook decides to de-platform groups on facebook for what they do on facebook, they aren't banning people on a shared bad people list. That would be a kind of cartel/collusion which breaches other restraints on a company's behaviour.