Using .so as a TDL for an application domain name?

Hi! It seems like .so has become more popular recently as a TDO for startups. I wanted to solicit thoughts from the community on this, as I’m considering purchasing one. The +$60 price tag makes me cringe a little bit, but the .com and .io and .app for the same domain are either taken or listed for sale at an outrageous price. Any opinions on the .so extension? Can anyone speak to the SEO impacts? Thanks everyone!