Don't count on PWAs. Once these free speech platforms start embracing PWAs and they become super popular, Chrome and Safari will simply censor them directly. When you will try to visit these PWAs, you will get a message that says "this website contains hate speech and has been blacklisted as it doesn't respect our terms of services for a safe and friendly browsing experience we thrive to offer our users".

Any browser that allows accessing these PWAs will be banned from the app/play store. Let's not kid ourselves this isn't what's coming next.