Yes, the hashtag feature works for me. Are you logged in to Pixelfed? It seems like you have to be logged in to be able to see the hashtag feed.

Yes, I have a user on pixelfed.social. I like it, and use it daily.
It is kind of like Instagram, but in the fediverse and is open source.
A cool feature Pixelfed has is the ability to follow hashtags, so your home feed will be a mix between posts from the users you follow and the hashtags you follow.