Blorp dev here. I'm not sure I understand hashtags well enough to implement them yet. From what I can tell, @saltywizard@beige.party either manually linked the hashtag to Mastadon, or more likely, whatever client they used inserted the link when they types the hashtag.

To demonstrate my point:

1. Here is a hashtag I manually linked #alt4me
2. Here is a hashtag I did not manually link #alt4me

In Blorp, 1 is clickable for me, but 2 isn't. Depending on what client you're using, 2 may get auto linked.