If someone recommends an account to follow and it looks blank to you, it probably isn't actually blank! It probably just looks that way when you view it from your server.
If you follow the account, future posts will start showing up on your server.
It is confusing, but there are really good reasons why it happens. You can read more about it (including how to check what a profile really looks like, and how to prevent your own profile looking blank) here:
That's always confused me a lot.
I couldn't tell if I'm blocked or if it's a glitch or what.
Yeah, hopefully the article makes things clearer.
Also, as mentioned in the article, people can prevent their profiles ever looking blank if they pin posts, so I try to encourage this too:
https://fedi.tips/how-do-i-pin-my-posts-on-my-mastodon-profile/