I really feel you on that, as I thought of recently passed @joannekwan when we got the news about Tapas getting closed. And I really hope there are physical copies of her work, at least I know there are Kindle copies, so her relatives and friends can print the books.
But then... everything will be lost in time eventually. One way or another, sooner or later. There were different social media exodus lots of time before that, people are losing their accounts on different platforms all the time and losing their creation works in every different ways, even the physical ones. So the best we can do is to look forward, not back.