"Why give something away for free if you could charge for it?"
I don't mind so much if I can pay for improved latency, but if the standard service provided is purposefully degraded to justify it then that's when it's iffy
There would also need to be some serious data to support an actual benefit compared to the standard latency
Because that's what's happening with datacaps, they are charging hundreds of dollars per month because there is no unlimited data on gigabit connections.
Meanwhile, in Italy you at 5€/month for 50gb of phone internet. And that's sticker price!