Yes, sure, having to pay for each tweet is a drawback compared to the commercial version of Twitter.

Please note there's a donation mechanism [1].

If others like what you write, there's a chance you can get back some of the money you spent on tweeting ;)

Still, using blockchain technology has positive aspects, like some kind of censorship resistance. That is, if some country is going to block access to Twitter again: who knows, can this be an alternative? Not saying access to the ethereum network can't be blocked at all, though.

[1] https://github.com/yep/eth-tweet/blob/master/TweetAccount.so...