Well I guess my next is an apple, but I'm hoping open-source android distros will get more dev resources now. Will happily use a sub-optimal distro over google's.
This of course has nothing to do with security, it's mainly the managements reaction to Youtube alternative apps actually growing in userbase (happy user of one here). And also to ban alternative app stores naturally.
Let us all not forget that YT videos are internet users created not google created, and the only reason why Google thinks this will work for them is their belief there is no competition to YT.