It's a good thing there aren't numerous open source alternative databases that can be hosted by numerous other services then.
Oracle's got a lot of nasty things going for it, for sure. But there's a reason people still use it: part of it is vendor lock-in, of course; the other is that the database is actually really nice.
Migration Complete – Amazon’s Consumer Business Just Turned off its Final Oracle Database
Today I would like to tell you about an internal database migration effort of this type that just wrapped up after several years of work.
And chances are, you started using Oracle because of some enterprise software somewhere for which you don’t even have the source - so good luck.
And don’t forget, Oracle will encourage you to use all their Oracle specific stuff everywhere in their documentation. It’s a giant, idiosyncratic mess.
I guess you could call it "vendor lock-in" to use the more advanced SQL, analytic functions, and stored procedures or you could call it "getting what you paid for."