I don’t really see the point in developing a whole new app from scratch when there’s an existing app with infrastructure already on the market they could take over.
It might be hard for them to monetize on the purchase though: let’s say, for argument’s sake, they purchase Pocket Weather and associated infrastructure for $10,000. They won’t make any money from existing customers who’ve already purchased the app, so they’ll need to maintain it and rely on new app purchases to bring in money. There’s also the option of moving to a subscription model, but that may piss off customers who’ve bought the app and are suddenly being made to pay again.
My whole point being though is Shifty Jelly shopped the app around, and if Bjango wanted to make a weather app, they could’ve given that consideration. Maybe they did, I dunno.