Your logic here is absurd. If someone needs internet for parnassah or school, they should use it for that and no more. Why should they stay on the internet longer to also use it for shiurim?
It’s not like a choleh eating shiurim on Yom Kippur. There’s no inherent issur, it’s a sakanah to have it because it may lead to issur. Once you have it, though, you’re a chossid shoteh if you don’t use it for useful shiurim and shmoozin.