You can get a mortgage as an influencer. You don't say your job is 'Tiktok' lol. You just need to show stable income for a few years, which they'll have by the time they buy a home, and that you're sensible with money. It's the same as freelancing. The same risk is there. Except influencers usually have it easier anyway since they have huge deposits upfront most of the time.
Those girls, having been living at home throughout the peak of their success, will probably have £50k+ deposit easily. Enough for a regular new build in the shit hole town they live in.
They'll be making the bulk of their income now and likely do what every other influencer does when they start to dwindle in popularity, invest behind the scenes in companies without their name tied to the front of it.