[1] https://downforeveryoneorjustme.com/svbtle.com
[2] https://webcache.googleusercontent.com/search?q=cache:LXB7R6sD2i4J:https://svbtle.com/promise+&cd=1&hl=en&ct=clnk&gl=us&client=firefox-b-1-d
I always had a sort of genial skepticism of Svbtle: I liked the idea, but there was something a bit...for want of a more gentle term, a bit blowhardy about Dustin Curtis's own writing style, and like others, I was bemused by that "forever promise." It's impressive, but how can you guarantee that? In fact, it doesn't guarantee it, precisely, based on the footnote of the linked content:
> “Forever” means until the HTML-based “web” is no longer generally accessible or until Svbtle or its parent company becomes financially insolvent (which we intend to avoid given that users pay for the service).
(Emphasis added.) Many years ago I signed up for the "lifetime hosting" at TextDrive, which turned out to really mean "until the parent company went all-in on managed enterprise hosting"; Joyent's management appeared to be somewhat surprised and irritated that we expected "lifetime" to mean "if not our own personal lifetimes, then at least as long as your company is in business". Svbtle clearly tried to do better, and I don't doubt they meant it, but it's still a big ask.
Having said that, I also suspect it's basically a one-person business, so goodness knows what's up. Is there a customer service email address? Have you tried emailing "hi@dustincurtis.com", which appears to be Dustin Curtis's email address?
I don't know anything about Svbtle, but ultimately that isn't a promise anyone can realistically make regardless of the best intentions. You need money to run servers. What happens when a company runs out of it or even ceases to exist? What if there's accidental unrecoverable data loss due to a bug or outage? What if the operator gets hit by a bus?
If you have data you care about, hold it yourself (and back it up). Trusting a random free online service with the sole copy of everything is foolish.
But, there's a lesson here. Nothing is a replacement for backups and you'll care more about your own stuff than anyone else will.