I've been using a website for 15 years or so that had a similar situation. The creator/maintainer got a short prognosis, but made an effort to ensure that his service would outlive him.
Even though I'll never meet Josh from Spamgourmet his work continues to make my life a little bit easier on an almost daily basis. I hope Roy's legacy is able to continue in the same way and that he gets some comfort from that.
I have used Spamgourmet almost since its inception. Maybe the first great SaaS, and you couldn't help but immediately notice it was built by a lovely person.
Despite having only months to live, Josh was working on a plan to shut the site down in an orderly fashion as long as he was still able to notify all users, but then his son stepped in and took over part of the operation.
Dan Jezek died way too early and his family worked hard to keep BrickLink alive - and now it will continue as it’s under the umbrella of the LEGO Group. https://www.danjezek.com/
Even though I'll never meet Josh from Spamgourmet his work continues to make my life a little bit easier on an almost daily basis. I hope Roy's legacy is able to continue in the same way and that he gets some comfort from that.