Yes, you are free to create a fork.
In reality, it's nearly impossible to keep up with Google's development pace and their behavior of dumping huge changesets and lack of documentation and communication wears everyone out. If you have some exposure to biology/ecology you'll recognize the behavior as very effective at killing off diversity in ecosystems. It's like trying to co-exist on a lake with someone that keeps deliberately causing giant algal blooms.
Huh? You've obviously never involved yourself in Chromium development. It's easy to get started and to stay up to date. As with all massive projects it takes work to do so, but no more so than any of the other open source browsers.
You're far more likely to have hidden discussions about features or get patches obsolete due to code drops out of the blue when trying to upstream to Chromium.
>Firefox even has similar automated downloaded of binary blobs like the EME plugin.
Mozilla's EME stuff was widely discussed, announced in advance, and coordinated with distros.
Not quite in the same league as this.