If anyone is actually interested in learning how this works, this is a great blog post, from an author convinced like many that it's a stupid thing for the rich, until... Well have a read: https://waitbutwhy.com/2016/03/cryonics.html
So just to expand upon the article author's one possible future of it being overwhelming which he briefly glosses over, please enjoy this animated reading of one of my favourite graphic novels: Transmetropolitan
The author tries to disprove that cryonics isn't limited to rich people, while also pointing our the $200,000 upfront cost. Sure, a middle class American could probably swing the $300 annual fees, but most would be hard pressed for the $200k upfront cost.