They are attempting to gain market share with this. What else can they do, too many corporations only allow Chrome only, most React/Angular devs prefer Chrome and probably aren't going to switch anytime soon. Mobile browsers are stuck with their OS's core browser engine regardless of what you "download".

>Mobile browsers are stuck with their OS's core browser engine regardless of what you "download".

iOS is, but Android allows you to use your custom browser engine. There aren't many besides Firefox and that one ain't great, but it's doable.