Trump wasn't banned for his political beliefs, he was banned for violating the TOS. Trump's supporters conveniently forget that he was allowed to run rampant across social media for four years and given far more leniency than anyone else, and of course they're pushing the narrative that his ban was part of some vast leftist conspiracy, but the reason he was banned and Biden, Obama and others weren't is because Trump was raving like a lunatic and seemed like he was about to start a civil war, and Biden and Obama have done nothing of the sort.
And what has been the impact been of Trump's ban? He's still perfectly capable of getting his message out. His followers are perfectly willing to move to non-mainstream sites like Parler and Gab, and they're still all over the mainstream sites to boot. He's still the overwhelming favorite for the GOP in 2024, and he's starting a social media platform and possibly a streaming TV deal. Trump simply not being President anymore has had a bigger chilling effect than being deplatformed.
As always, the right's hatred of the left has led them to overplay their hand. It's obvious to everyone that neither Trump nor his supporters are oppressed, suppressed or censored in any meaningful way, and certainly not to the degree that they claim.