Great when a company goes out of business and the domains are dangling. Next one to scoop it up takes over source code that others new depend on. We've seen this many times already in other ecosystems. It is a very bad situation.

It is bad advice to move your packages under your own domain. You will never be as good as Microsoft to keep paying for the domain. There are no guarantees in life but I do guarantee you that when you go out of business, that domain is the last thing you will think about.