Not afterlife. It's just another medical treatment. And not one that much different from the current system world wide. If you have money/power you get better access to healthcare.
Sure, basically-everywhere-but-the-US has socialized medicine, but still everywhere if Jeff Bezos got sick he could go "I'll buy this hospital end every doctor in it. Do your best to cure me".
Freezing isn't magic. Just think of it as a better CPR. You wouldn't say this woman got "afterlife", even though apparently her blood wasn't pumping for 40 minutes:
https://en.wikipedia.org/wiki/Anna_B%C3%A5genholm
It depends. If cryonics becomes widespread, "ancient people" in suspended animation would be pretty common. There wouldn't be that much to learn from reviving all of them.
There's an expression called ruling from the grave to reflect the difficulty of enforcing a contract after you are dead. The same principle applies as those frozen people are dead in every legal sense and practical sense and likely any biological sense.
I would be extremely motivated to revive them and promote reviving them because I would also want to be frozen and revived. I assume this would be even moreso the case if society develops reviving technology, and therefore knows it actually works.