I'm not so enamored with feeding the bloated behemoth that is Google but I do like the fact the revenue share with creators gets them more per view than they would with ad rolls. It's a shame you still have to manually skip sponsorship sections on the mobile app.
Linux supports loads of filesystems. ext4 works well for most people and is considerably easier to use without jumping hoops for Oracle's deliberately misaligned license for ZFS.
RedHat are key contributors to a stack of open source projects aside from the kernel itself. For example they are one of the lead contributors to QEMU, far ahead of Oracle.
I pay for access to Newsblur which is an RSS aggregator with open source mobile apps. For stuff like bug feeds and tracking wiki updates on projects I use elfeed within Emacs.
I don't think it's quite as simple as that. Both flatpak and snaps use similar technologies but have divergent visions on the user experience. It's not like RedHat fell in line and adopted upstart rather than developing systemd. There has to be space for competing approaches to the same problems rather than forcing everyone into an open source monoculture. I know people decry the wasted effort but it's not like you can force open source developers to work on your preferred solution.
I don't think they are. You can distribute the corresponding source for your binaries. You just won't get updates to the binaries (and their corresponding source) afterwards.
That was the flattr model but it never really took off.