@feditips
Yet, on the joinmastodon it is said by default:

mastodon.social The original server operated by the Mastodon gGmbH non-profit

And the next one is mstdn.social

I see no real difference here — you afraid of concentrating people on a single server without choice. But new people will surely tend to choose the 1st or the 2nd one, even while they have a choice.