I guess the flipside is, if I die tomorrow and then there's a PHP error on my website, no one's ever going to know how to fix it. So my memories and diary entries die as well. My "fix" for that is to export the ~2400 diary entires every few months into one massive PDF file.
Edit: I understand why this is being downvoted, I just want to clarify that I didn't mean the opening sentence to read as if people who trust 3rd party websites to their hosting were silly/dumb, though I realise now that's how it scans. What I should have said was "It's very unfortunate and a sad state of the current Internet that people trust websites like this..."
But it is, XYZ is their business platform, their social media network, their journals, their photo hoster, their "lifetime membership", etc. I ran into this all the time with clients. They would worry about what happens to their consultant, but never to their infrastructure.
So for businesses: have a plan B, and have usable archives / backups. And for individuals, have a plan B, and have usable archives / backups.