Wireless providers are competition for home internet service the same way the gas station down the street selling water bottles for $3/each is an alternative to running water.
You aren't going to get a $300 water bill just because some company in another state spent several days secretly filling your in-ground pool with the garden hose without permission, nor would anyone tolerate having that happen repeatedly while being told they can only brush their teeth but not flush the toilet for the rest of the month.
A while back, the DSL here was not working for a few days, so I connected my iPhone to my Macbook. Normally that's not an issue while away from home or in a car for an hour or two, as there are limits to how much data anything could use in that amount of time.
Apple's Photos app proactively downloaded something like 25GB of old stuff from iCloud Photo Library that I didn't ask to download, didn't browse through, or even remember having, simply because the local drive had free space and Apple decided that both the space and the bandwidth were freely available for it to waste.
If wireless providers were forbidden from imposing ridiculous data caps I would be fine with calling them competition, because we do have multiple high speed providers here, they're just not usable because they'd rather be selling water bottles.