Money is not the right reason. Megas history only shows that they were interested in money, everything else was just a publicity stunt. Mega even got sold a few years back.
Context/region blocking is a very quick and inexpensive path to basic security. At work I have sets of iptables rules to block regions by country code and by context (i.e VPN provider, datacenter provider, etc). I've found that some services will go from tens of thousands of brute force attempts per day to 1-2 per month. It really is crazy the amount of routine attacks that come through VPN providers if you host services in the professional world.
Does this mean that legitimate users can't use a VPN to access our services? Yes, but we also don't sell any data to any third parties so I don't feel so bad about it.