The deplatform calls might be targeted at the hosting company, many instances will block his one, and the Mastodon ecosystem will split because many LGBT people use it and they don't like him. It is more likely that he will move to Gap, Parler, or something like that which markets itself as preserving free speech.
I don't know about the load capacity of the activity pub protocol, but Mastodon is built on elixir and it might help somewhat.
Can you clarify? I've never met "consequence free speech" as a term. If you mean that there are real consequences from his free speech, I'd agree, but I'm not sure what do you mean with it.
Free speech is generally considered to be the ability to say things without government censorship, imprisonment, physical harm, etc. The type of thing the US first amendment is meant to protect.
What right wingers often seem to want is "consequence free speech", where they are protected not just from the above, but from any negative responses or criticisms.
The leftists are saying because Trump challenged the legitimacy of the election results, they feel sanctimonious that instead of investigating claims they have the right to attack Trump voting US citizens (75 million) as a group whether politically or in unamerican ways such as in attempting to block free speech, arresting them, burning and destroying their businesses, attempting to get them fired from their jobs, etc.
Leftists live in cities around people that have similar values to themselves, whether LGBTQ, pro legal prostitution, free drug use, anti-white hate. When they confront Trump supporters, their mental model is that there are a few hundred people in that group who deserve "consequences" and that they personally are legitimate in effecting those consequences. They frequently don't leave the inner city and cannot really conceptualize tens of millions of people.
I mean, I'm not American, so I don't have much skin in this game, but from the outside, just no.
Challenging the legitimacy or outcome of an election is one thing. Democracy wouldn't survive if you can't challenge it.
They've had their challenges. They went to court 60 times and were dismissed or lost 59 times. Notably, the lawyers never actually claimed voter fraud in court because a courtroom has consequences for lying.
Furthermore - I think you'd be hard pushed to find any civilised democracy where a bunch of armed yahoos storming a building full of politicians is a valid "challenge". It's really more of an insurrection, which is pretty much the opposite of what democracy is about.
As for the actual topic: "Consequences" is nothing to do with your political beliefs or where you live.
There is no law against, for example, a person believing that "the jews deserved it". In most places there aren't laws against them saying it either. But, if they do say it, there's also no law protecting them from every possible consequence of saying it: e.g., being banned from a synagogue, or being called human garbage, or, if you happen to be using a private organisations equipment to broadcast that view, having the mic taken away - be it literal or figurative, such as a social media account.
I don't know about the load capacity of the activity pub protocol, but Mastodon is built on elixir and it might help somewhat.