There is verification of sorts for what it’s worth - you drop some HTML on your website, then tell Mastodon to crawl your website to look for it, and if it picks it up, it verifies that your Mastodon account and website are linked.

It helps for all sorts of use cases beyond “this is a famous person”, since people who run smaller projects can also verify who they are on Mastodon - I have 2 verified links on my profile for example.