Functionally? Probably not much, Morally? Massively...
Carista, OBDeleven, Ross-tech and VCP are creating, updating and supporting their own product. It takes money and resource to keep these things working as VAG change protocols/modules. When buying a genuine version of any of these tools, you're effectively helping that company survive, profit and continue supporting/developing their product in to the future. When genuine, I don't mind which interface people use, they all have pros/cons.
A cloned version is someone stealing the hard-work and investment that one of these companies have made, reproducing and then selling it for their own profit.
That's where the difference lies. Even more so when they claim their cloned version is genuine as they did with you
Ross-tech and others have certainly have done lots of reverse engineering to understand the VAG protocols, I'm not sure if they have any insider knowledge or have purchased an official dealer tool to figure it out. I expect the latter as they tend to play catch up and the next VCDS version will add support for newer vehicles. I certainly wouldn't class it as a 'hacker' product.
I believe that some 3rd party diagnostic companies have used Ross-techs label files in the past which is why they are now encrypted. I'm not sure if Carista, OBDeleven or VCP have ever been accused of this but I expect there will always be a degree of copying and reverse engineering between these companies. It's always easier to copy...
You also need to remember that VCDS is primarily a diagnostic tool, the fact we can change coding and adaptions which makes enabling various hidden features or retrofits possible is pure luck
As you may have seen, VAG are introducing ways to prevent any none-dealer tool from changing things with SFD tokens. Hopefully Ross-tech can come up with a solution to this, I know other companies are although they are of questionable legality and my be short lived.
That I agree with completely
The one touch functions are terrible in my opinion and destined to mess up many cars given the lack of checks! A well written set of instructions are much better, if nothing else, it should be clear when something isn't matching which is a sign to stop