Just had a nicely worded letter from a company called "Domain Renewal Group" noting that my domain name is about to expire (it is) and that I can "take advantage" of best savings by switching to them.
So not really a scam - if you read the text properly they leave an ample trail that I'll actually be switching domain registrars if I use them. On the assumption that they'd continue to manage the domain - and the web stories on this are unclear so perhaps they will, perhaps they won't - then the only question is whether this is cost effective. It isn't - there're more than twice the price that I pay currently.
Beware ... always read the fine print. Domain Renewal Group may not be all they appear to be. And they certainly charge more than you need to pay.