It's a pretty legit business model; just because it's illegal doesn't necessarily mean the government wants to go after them. "Focused on paying illegal ransoms" = "allows companies to recover from devastating attacks by being a middle-man for paying the extortion fee and getting the decryption keys". It's probably one of those things that the government tells people not to do, but acknowledges is inevitable in many cases.

A company I worked at once had a meeting with such a firm, and it all sounded pretty reasonable to me. Obviously, one would hope the company has backups (which are stored in a place that can't itself become encrypted), but if they don't, sometimes the cost of paying the ransom is far, far lower than the cost of staying down. These middle-man firms have probably saved companies from enormous amounts of damage. Another commenter claimed these companies are often in cahoots with the ransomers, which maybe is sometimes true, but I highly doubt it in the case of the company we dealt with, or other US-based companies with physical locations that meet on-site.

Of course in an ideal world no one wants to reward criminals, but just to give an extreme example, if someone kidnapped one of your children and held them hostage, you'd probably pay anything to get them back, and that's not far off from the situation some ransomware-affected companies end up in.