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Probably because not enough people care enough. If you want to start one of those, here's a good starting point: https://newgtlds.icann.org

Certainly nobody is stopping someone from applying for these gTLDs. It's just an expensive process, IIRC.

The community for straight people is too disparate to be meaningful. .bi is interesting though..

Yep. As a straight person I really don’t feel that I have very much in common with someone just because of the fact that they’re straight.

Two-letter codes are generally countries. In this case, Burundi.