Even 10 years ago I knew people cancelling their broadband to just use mobile internet. It's smart to cancel broadband if you're not streaming video, or if you are streaming but have a fast mobile network connection and decent plan. It probably sucks for any real-time stuff like gaming, but otherwise it makes sense. I don't doubt many people would rather cancel broadband than turn their boiler off.
Ironically, 8-10 years ago my carrier's cellular network felt so fast that a young, naive version of myself expected to never sign up for broadband internet. I used to actually play video games on this connection because it was way more reliable than my home internet connection. But in the past 4-5 years, this same cellular network has become a high jitter, low bandwidth disaster, despite "upgrades" from 4G LTE (i.e. faux 4G) to what my carrier claims is "5G".
I'm aware this is just an anecdote and n = 1 implies infinite variance and what not, but it's amazing seeing countless people have such a good cellular network they can just ditch broadband subscriptions.
I'd seriously consider it if not for working from home. Other than that, all we really use our home broadband for that I couldn't do with my phone is streaming—and you can buy/rent quite a few discs per month for the cost of broadband plus streaming services.
