I wish I remember where I read this recently, but supposedly any email provider outside of like the main 5 will have a lot more trouble getting through gmail spam filters, which is a major push towards getting people to use gmail or one of the other main providers
AFAIK kbin is just Lemmy+Mastodon mixed into a weird combo so yeah, it just acts like another Lemmy instance for the most part
tbh I was thinking about this today, and I think there is some merit to having the setup be slightly obtuse so that more of the people on any given thing are the kind of people who think this kind of tech is important, rather than people who don’t give a shit about that.
At least, I like when spaces are more densely that kind of person. But other people should have nice things too I guess.
It also grants a small amount of credibility of not being some random new account shill or whatever, but given how accounts can be sold, it doesn’t really do that if you’re paying any attention