There is a 0% chance that 80M+ are agreeing "I am OK with Luminati selling access to my home internet connection to any party able to pay", which seems like an honest description of their business model. More likely Luminati is paying unscrupulous app developers to include this SDK in their apps, and some put some legalese into 10,000 word install-time agreements that no one reads.
I think you can make a reasonable argument that Hola VPN is largely exploiting users who don't actually understand and consent to having their IP address and connection used as a proxy.