It really isn’t. It is literally easier than making an email account.
MAYBE for a few days after hairplugs used his apartheid emerald money to buy twitter it was a mess. But very quickly joinmastodon.org/servers was updated to the point that it is just scrolling for MAYBE 20 seconds, picking an instance, and making an account. And then the only difference between the instances is the URL and your account’s domain name.
That is the equivalent of picking a server in an MMO/live game.
People are just looking for an excuse to stay at twitter.