Hi Gunnar-Haslinger and PS_Alex
For clarity here, I am neither arguing nor debating that you may have a challenge. I am merely providing info on what WinGet is designed to do and how it is able to interact with the Microsoft Store. As called out, WinGet is not a replacement for the Store for Business -- any conclusion or statement to this effect is incorrect. The Store for Business docs call out WinGet download as a path to downloading apps offline along with their licenses but makes no claim for it to be a replacement (as that would be incorrect as noted).
As for what third parties can (or cannot do), I can't and won't comment on those other than to say they may be violating our EULA and opening themselves to legal action (i personally wouldn't trust any third parties redistributing content from the Microsoft Store either). WinGet was not in any way designed to allow the deployment or download of licensed apps. This isn't necessarily a technical limitation but that doesn't change it being something that WinGet cannot (or is not allowed) to do.
Again, I fully concede that you may have challenges and that WinGet may not be the best path for you to address these challenges (as it may not be intended to). This is why discussing what the challenge is is important instead of hyper-focusing on what WinGet (or any specific tool) can or cannot do.
Microsoft