While I would also prefer a decentralised and free solution, this is not a pyramid scheme. What the people are paying for is a network that is "free" from public mainstream media influence.
Naturally, for X this means that those people prefer paying for Musk's control and at least trust his promise to allow free speech.
I personally find that free speech is something that no platform can provide unless it is fully decentralised but I am also paying for X today, because from what I can see it definitely provides me with an additional point of view compared to mainstream media.
Even if I disagree with someone's view on an issue and consider it stupid; I do not believe there should be an arbiter of truth.
The truth can only be found through engaging with a broad range of world views and show curiosity rather than blind dismissal.