Please consider writing your hashtags in upper camelcase so screen readers have a chance at figuring them out.

#whyistayonmastodon sounds like an giant undecipherable mess of sounds.

#WhyIStayOnMastodon reads out "Why I Stay On Mastodon" 😄

(Reason #44 I stay here: my previous requests like this have been generally well-received, proving that most people are awesome.)

@jond I first read that as "Why is Tay on Mastodon" and I was like, woah, they put Tay on Mastodon?

I think this proves your point even more.

Also, Tay on Mastodon would be hilarious.