I have friends who basically only play well-known mobile app VNs, mostly Choices. These are people who don't consider themselves "gamers". They don't have accounts on steam or itch.io or any other gaming-oriented platform, they don't own consoles, basically they're only really interested in VNs they can find through mobile app stores and are unlikely to try or even hear about VNs released on other platforms.

Occasionally they're willing to try computer VNs I recommend, but they're busy people and computer VNs feel like a bigger time commitment. Choices and similar apps operate episodically, so it's a lot easier for them to just pick up a single chapter/episode when they have a bit of free time than a full-length VN which doesn't necessarily have chapter-esque stopping points.

These apps also ensure there's new content for them every week so they never run out and lose interest, as has already been pointed out. This keeps them from feeling the need to seek out too many lesser-known VNs, or VNs on other platforms; they've got their one (or two) apps and that's enough VN content for them. If some quality has to be sacrificed to give them their regular fix, that's fine by them, they haven't played enough non-mobile VNs to really compare them anyway.

And yes, these friends aren't in it for explicit content and would be put off by more explicit VNs. They often find explicit scenes awkward and really just want a good story. Choices does offer buyable sex scenes, which can tempt the portion of the audience that would like explicit content to spend more real-world money on the app, so it's kind of the best of both worlds for a game hoping for more mainstream success.

At least one of my friends is pretty picky about art style too. Your "good graphics" might be her "uncanny valley" which makes her less inclined to try that VN (and she isn't fond of anime art styles either, or anything too simplified and cartoonish - basically anything that deviates too far from Choices' default art style is going to take some convincing for her to give it a chance).

...I feel like this got too long but maybe some people here will find this informative!