It's a "final straw" situation. No individual straw broke the back of the proverbial camel. One straw after another was placed atop it until finally the back broke. It's not the final straw that broke said back, but the load of all the straws including the final that did it.

So they're not necessarily quitting because of the name change. They're quitting because of everything else plus the name change. That was the thing that pushed the go/no-go decision into "go".