About 10 years ago I had just started at a company that had previously made Flash widgets (weather/sports/stocks) to put on your site. They had pivoted to JavaScript tools about three years before I joined the company, and had discontinued their Flash support a year earlier.
The very first conference call I had with a potential customer was actually someone who claimed to be losing billions of dollars because our Flash widgets didn't work anymore. They were livid that we'd stopped supporting them, and threatened to sue us if we didn't turn it back on.
The poor sales rep and I didn't know what to say, because she had started about a week before me and didn't even know we made them. I'm guessing they didn't sue because we never heard about it again.
If you have access to the analytics, you should have received several emails over the last year. Everyone of my coworkers with access and myself all got the emails.