No, not all start as light novels. In many cases the light novels come afterwards as a way to capitalise (eg Demon Slayer, the manga finished a while ago, so while the anime is still running light novels are coming out).
Apothecary Diaries started as a light novel, but JJK, AoT and many others start as Manga
But did you really scan the items they wanted? Most people in my local community scan their hands or the pavements around the pokestop.
They have a great map of London pavements if they want to do it.
The problem is the length in men's trousers which doesn't fit shorter women. But yes, I have 'mens' hoodies and other items which tend to have great big pockets...
And this isn't limited to jeans. If you take an average hiking coat men's ones also have more and better pockets to women's. And we do not take handbags on hikes.
Apothecary Diaries started as a light novel, but JJK, AoT and many others start as Manga