My personal email has been the same earthlink.net address for about 25 years now, and it’s been pretty worry-free in that time. My email client keeps all my email locally. I pay for service, I get that service. I guess it’s possible they’ll go out of business someday, but I’ll deal with it then. I don’t lose data over it.
How good is spam catching on those email providers? Because I'm disappointed as heck in my old Hotmail/Outlook account's spam catching, and if MS can't do it right what hope to smaller players have?
So far Fastmail has been quite good. My email address is ancient, so I get a ton of spam. (Over 99%, last I checked.) I see less spam with Fastmail than I did with my layered, carefully-tuned anti-spam filters.