Apparently most young lesbians are now femme, or "lipstick" lesbians who basically look like regular women, and butch lesbians are dying out. It's not clear why this is happening, although tomboys transitioning into men may be a factor.

>This “shortage” describes the supposed lack of available masc-of-center people to date; simply put, there are not enough single butches, studs, or mascs in general, to go around. The complaints ring out the same: every good masc person is taken, and the remainder are either corny or toxic. A lot of the videos lamenting this situation are meant to be tongue-in-cheek. Some try to make sense of the shortage, citing reasons like masc4masc dynamics, straight women being “over men,” and increased demand generally. Others are sincere calls to the universe to send more mascs their way. Even the queer dating app Her has sounded the proverbial alarm, offering free lifetime subscriptions to mascs to “combat this sapphic emergency.”

>The masc shortage of the moment may be new to TikTok, but the sentiment is recurrent within intracommunity discourse. For decades, some cis lesbians have claimed that too many masc people are transitioning out of lesbianism and, as a result, out of their dating pool.

https://www.them.us/story/unpacking-the-so-called-masc-shortage-transphobia-essay
https://www.reddit.com/r/LesbianActually/comments/1gy5sv2/what_is_up_with_this_masc_shortage/
https://www.reddit.com/r/QueerWomenOfColor/comments/1i1lror/is_there_really_a_masc_shortage/

What is causing this?

https://www.touristisrael.com/why-tel-aviv-is-the-ultimate-lgbtq-travel-destination/26062/

Israel’s LGBT community is suffering

https://www.timesofisrael.com/liveblog_entry/tel-aviv-confirms-todays-pride-parade-canceled/