

Calling this a Marathon game makes no sense, and I don’t just mean aesthetically. The business case can’t possibly be there, either.
Anyone who has a nostalgic attachment to Marathon (👋) won’t be interested in this new game, and anyone interested in this new game probably doesn’t care about the name “Marathon.”
On top of that, there’s the fact that Marathon kind of looked like Halo. When Bungie made Halo, they were clearly taking after their own art style from their previous games. Which means Bungie could have announced that they’re making a singleplayer first person shooter that kind of looks like Halo. Everyone would have lost their minds. Instead, they announced yet another live service game, and no one is interested.
Android itself does plenty of data collection on its own; I’m not sure if the brand really makes much of a difference here, unfortunately.
I installed Sailfish OS on a Sony Xperia phone a few years ago, and that worked well enough. I had a couple of Android apps that I needed to use for work, and Sailfish has some kind of Android environment built in that lets you run Android apps. I worked for me, but I didn’t try any payment apps or others that tend to be picky about what type of phone you’re using.