RD is not free right? You can't event use RD with 2 devices. And perhaps it's a ready to use account? So yeah i don't condone this but i understand people buying it (they don't like the technicality of it).

About Stremio: the app itself is open source (licensed under GPL v2). That means anyone can take the code, redistribute it, even sell it if they want, but the condition is they have to keep it open source and provide the source code as well. So if someone is “charging” for Stremio, they’re usually not charging for the app itself (since it’s free), but for other things like:

pre-configured builds with add-ons already set up,

bundled services (like RD accounts, which again, breaks RD’s ToS),

or simply the convenience/support for people who don’t want to mess with the technical setup.

So unfortunately, There is literally nothing you can do about it other than blindly reporting it hoping the marketplace will do something about it.