Cases in point… you can still buy themes here from companies that don’t exist anymore. Michael David design has been AWOL since 2015 I think, but his themes are still sold. His website is still up, and one could buy stuff unaware the company is a ghost.
BLT, Brandon Lee, is another. Zero activity on Twitter since 2017, and his website is offline. Yet, you can still purchase his themes here online.
Do they still work? Maybe. Especially if you are running an older legacy version of RW. That being said, I am sure there are many aspects that simply won’t work anymore. I am sure there are other products too, I chose those two because I have a bunch of their work. Caveat Emptor.