You seem to have the false notion that corporate distros are safe (or something). But, that's not true. Look e.g. at the demise of Clear Linux OS.
For (perhaps) a better assessment on whether a distro is well-established^[I.e. that it will not cease existing overnight.] or not, consider looking at the following factors:
How long does it exist? Like, if it's old enough to drink, then that's definitely a good indication.
How strong is its community? If there are literally millions of users, many of which actively contribute, then that's definitely a good thing.
How active is its development? The Linux landscape is constantly evolving. Hence, adopting changes (or, at least, enabling them) is somewhat to be expected.
Does it serve a distinct raison d'être? It simply has to offer a strong justification for its existence.
Does it have any strong dependencies/contingencies? Here, a lack thereof is actually what's good.
TL;DR: If you want to be absolutely safe, then I'd recommend Arch, Debian or Gentoo.
You seem to have the false notion that corporate distros are safe (or something). But, that's not true. Look e.g. at the demise of Clear Linux OS.
For (perhaps) a better assessment on whether a distro is well-established^[I.e. that it will not cease existing overnight.] or not, consider looking at the following factors:
TL;DR: If you want to be absolutely safe, then I'd recommend Arch, Debian or Gentoo.