When everyone was on dial up and modem, because it was the only way to connect to the internet, advertisers were limited, pop ups, static banners on sites, etc. Broadband is like a road, widen it, make it faster and it just fills up with more traffic.
Adverts on sites now are animated, all singing, all dancing but what is the result? More crap you do not want, did not ask for and would rather avoid, coming down your line and choking the bandwidth.
It does not matter how fast broadband gets if it is going to be filled with stuff you do not want, the faster it gets, the bigger and more complex the adverts, result: What is left isn’t significantly faster.