IMO sounds a bit stupid

Ok, fine I guesss? I’m not advocating for anything, I’m just telling you about something that exists.

So I’m surprised you claim it’s widespread.

This sounds a lot like you’re implying that I would make this up, I have no idea why you think this but DFS, balancing service, and the UK balancing mechanism are all UK markets that allow you to do this. The UK isn’t unique, but I’m not as familiar with other energy markets.