What's the startup that you liked the most that had to shut down?

We all know that sometimes having a good idea/service/product is not enough to make a successful business.

Sometimes businesses have to shut down due to not having enough users to cover their costs and sometimes (probably the saddest) when they get acquired by a company that just wants the talent and they shut down products.

I'm curious to hear about the ideas/products/services that people like the most but had to shut down and if there are any stories on why they shut down...

If there are enough people that loved such ideas/products/services, it might be worth it for someone else to reconsider, and having this strong and active community seemed like the right place to ask.