I think it's a fair description to be honest. Granted, it's not some always running process grabbing your keypresses across different programs, but it is still a horrible privacy violation that is operating without most people's understanding.

Accidentally screw up a copy-paste? ctrl-z as quick as you like, it's too late, one of your passwords has been sent out to google...

It's a bit of an impassioned description of the feature, but this is a comment on HN, not some company press release. How neutered do we have to be that we can't make a point with emotion behind it. It's clearly much more hyperbole than "immature" or dishonest, is all I'm saying.