Ask HN: Which product you used to use made you build a better version of it?

Often, the ability of a product (website, application) to meet our needs declines over time. The product we used to find awesome at answering our needs becomes really great, then good, then average, then not so great then awful.

As the quality of the product you used to use declines, but your needs didn't disappear, you decided to build an alternative that perfectly meet your needs.

Any example?

Thank you.