I haven’t followed this software and company before, what do you mean, what is the catch?

Adobe doesn’t offer any of its software for free except acrobat reader, where you get nagged about paid features constantly, but it’s easy to ignore.

Why shouldn’t I recommend this over cracked Photoshop? Its features seems like closer to PS than Gimp or Krita.

Visual elements: https://osmand.net/help-online/license/

And fdroid shows it:

There is a topography plugin, you have to pay for it, but it’s free in the fdroid version: https://osmand.net/docs/user/plugins/topography/

There is also a topo map style, similar to OpenTopoMap, but no contourlines: https://osmand.net/docs/user/map/vector-maps/#topo

Mapy is another osm based map app (except for Czechia, map data is different there), some of my hiking friends love it, it’s not foss at all: https://play.google.com/store/apps/details?id=cz.seznam.mapy

Osmand is not fully foss as well.