The whole point of Van Life vlogs, insta's, etc. is to promote Van Life.
As stated, oh, along about Threads 2-4, there are lots of Van Life youtube channels, many of them by women traveling solo. Many are young women, but there are Van Life channels featuring various ages of people. People typically choose a favorite channel or two based on similarity to their own travel style. So, if people mostly cook out (as we do), we watch camping and Van Life videos where people do their own cooking. If we're planning a tent trip to, say, Sedona, with perhaps a couple of nights in a hotel, we watch videos that feature restaurants. Etc.
There was and is a niche for Van Life couple adventures. There aren't a lot of Van Life couple adventures (in fact, the one guy we watched, who used to travel with his wife, is now traveling with his father - because the wife is home with their babies, so we don't watch any more). The things that the two men do each day are not the things that the couple did together. The other solo woman traveler we used to watch...well, we don't any more, because she mostly started staying in one place for as long as she could (28-30 days) and it got boring.
For the demographic in which Brian and Gabby would have appeal, the couple angle (cooking for and with each other, kissy face photos, romance atop various rock arches) is super important. Of course they have to keep the narrative as one of having a good time. There aren't tons of Van Life youtube channels featuring a stylish young woman and her artistic fiancée and the style elements that Gabby incorporated into the van and tent.
It has occurred to me, though, that Gabby wasn't posting anything about businesses they might have gone to (such as the coffee shop in Moab). It's a courtesy to the owners to do so, and is much appreciated - and certainly leads to being remembered kindly if the travelers happen to pass that way again. OTOH, if Gabby felt they were already pushing local buttons by remaining 6 hours in a coffee shop (would love to know how much coffee or tea they actually ordered), then she probably would take that approach.
I don't think Gabby stayed in the hotel at Colter Bay, because it's booked up so far in advance and it's rather expensive. There is a campground there, though. Sometimes young people who are staying in campgrounds will allow another young couple (or an old couple!) to share their campsite. So far, I haven't seen any credible evidence that she was actually there - so if anyone can point me to it, that would be great.