Certainly not a new thing. Circa 1994 my dial-up ISP (with "unlimited" internet, the first one in the area) was oversubscribed like every dial-up ISP, they had

Certainly not a new thing. Circa 1994 my dial-up ISP (with "unlimited" internet, the first one in the area) was oversubscribed like every dial-up ISP, they had an order of magnitude less connections available than paying customers. When I actually set the connection to stay up 24/7, they shut the account down within a week.