You don’t even need hardware for it. Barrier is a software solution.

https://www.youtube.com/watch?v=-KiOMjqykbU&t=734s

Depends on your definition of free speech.

If that’s “you can post literally anything and there is no moderation”, then likely none.

Cause it would attract pedophiles sharing child sexual abuse material, drug traders and Nazis making lists of targets.
Why should anyone pay upkeep to host that? No advertiser will go near it, and it’s only a matter of time before the cops take it down and arrest people.

If it’s “post anything that isn’t blatantly illegal everywhere”, then try 8kun. But unmoderated platforms do not attract rational discourse:
Warning: Screenshot includes hate speech

X isn’t about free speech:

https://www.politico.eu/article/musks-x-suspends-opposition-accounts-turkey-protest-civil-unrest-erdogan-imamoglu-istanbul-mayor/

Also, the quickest way to get new software versions, in most cases.

Open Source software is not a product that needs marketing.
The devs making Gimp gain literally nothing from you downloading and using it.
Stop applying capitalist logic to one of the few aspects of life that haven’t been monetized yet.