I definitely won't stand by all of the business policies of various streaming companies, b/c it's all pretty wacky...
For an artist like Seger, or any artist who has sold tens of millions of records, there winds up being a bigger chance that someone who is using a streaming service, already owns your record in some form, and now you are getting extra money on top of them having already purchased it. Notwithstanding the issue with some of his catalog being out of print.
When a really popular catalog artist doesn't put their stuff on a streaming service, it sort of makes me face palm a bit for that precise reason. It's like... "dude, I already bought this on tape/vinyl, I probably bought it on CD again, and now I'm using this streaming service because I like the interface of the app, and want a good software jukebox. And now you would be making more money on top, if it was on this app, but it is not."
I also always think that the comparisons of payouts for streaming vs a radio play, are really apples and oranges considering that probably only one person is listening to a given stream, or a few at most.
What I think is a raw deal, are the people that have contracts that have put them in positions where they can't choose. And the default deals certainly don't make sense for most artists, new releases, etc.