Wait you actually think that when people are banned they simply just "go away"? Vanish in to thin air? Problem solved?
This is what makes Youtube, Reddit and Facebook so powerful. They can choose who can stay on their platform, and how much discoverability their ideas have if they are allowed to stay on the platform.
The power in those sites is that they are not siloed and at scale, meaning you can reach a much broader audience. Parler would never be able to influence the mass market because it was so specialized - making it ineffective at evangelization. WSB would never be what it is without the platform of reddit. Going to a small specific site will not have the same power, even though I think it is better to host your own hardware and do that.
I'm very excited about it personally, I like disruption.