They did, this is true. And so does Mozilla, for that matter. But what's also true is that the market leader is incentivized to break interoperability and lock

They did, this is true. And so does Mozilla, for that matter. But what's also true is that the market leader is incentivized to break interoperability and lock out other vendors. That was Microsoft; now it's Google. Or, put another way, I don't hear the EFF complaining about Edge at the moment. I'm happy that Google is at least trying to standards-track these bad ideas and not just unilaterally putting them in Chrome. But I wouldn't bet a dime that they aren't going to do exactly that in the future. 70% of the market is a lot of weight.