I just noticed this post now after I mentioned about the mobile app. Was it a recent change that there is a button that takes you to mastodon.social on the website?
It's been years since I was on the Fediverse, so yeah.
Either way, my point still stand. A button that takes you directly to mastodon.social, is a bad solution to onboarding and it leads to other problem like the fact that mastodon.social is really big and poses a potential threat for the Fediverse to be bought out because of it.