Ask HN: How do you feel about products that piggyback off other products

Explanation for what I mean by "piggybacking": Say you create a Gmail extension that does something that Gmail doesn't ship with. I would define this as "piggybacking" because the product relies on the existence of Gmail. Without Gmail, you don't have a product.

What does HN think of projects that do this sort of piggybacking vs those who don't?

I personally have mixed feelings about these sorts of products/services. On the one hand it can be a great way to bring value and generate revenue because so many people are already using the product or service that you are piggybacking off of and likely have the exact problem you are tying to fix.

On the other hand I see it as potentially dangerous. If that product or service either goes belly up or changes how it works, your product or service as a result can be rendered moot overnight.