I would want regulations only if we were talking about opening crates or other forms of gambling. But this is as upfront and crystal clear as possible where you pay money and you get a skin unlike opening crates. We can all agree that the horse cosmetic is a ripoff but it's open and upfront about it's shittiness with no aspect of gambling. Unless I'm forgetting something, gambling microtransactions are the only case where I think regulation is needed.

Edit: The reason why I think gambling should be regulated more so than the other addictive substances (sugar, alcohol, the horse cosmetic) is because gambling doesn't give you a concrete product. Unlike the others, gambling is getting the chance to obtain your desired product while the others guarantee a product to use.