Though if decentralization were to be hidden, it’d be a good idea to cycle through lots of well established general instances for user signups under the hood. The vast majority of people are just going to choose the default options, and if it’s all going to funnel into mastodon.social, that’s a lot of centralization of users. Ideally no single server lords over all the others in terms of user count, because that gives them lots of power other instances may feel compelled to abide by. Having power spread out across many different people helps keep things in check, at the very least making large or drastic decisions more of a round table affair.