SSPL isn't being used as an alternative to permissive licenses (e.g. MIT). It's being used to shore up the holes that AGPL doesn't cover[1], to enable the business model of "free for small guys, paid for by the big guys".

People want a license that says something like, "you can only use this if you also contribute to the commons, or if you pay for the privilege not to". SSPL is an attempt to be that. Maybe it doesn't do that job well, but don't confuse it as competing with permissive licenses.

[1]: https://writing.kemitchell.com/2018/11/04/Copyleft-Bust-Up.h...