> censorship implies a right to speech, in this case Google has the right to restrict the speech of it's users

I don't follow. Even if Google does have the legal right [1], that does not make the censorship less problematic, or morally right. And even if it's hard to make a legislative fix ("You want to ban companies from trying to protect their users from phishing?") [2], that doesn't undo the problems of the current state, or mean we should be silent about it.

[1] This is far from certain, as it could be argued to be tortious interference, abuse of market power, defamation if they call something phishing when it's not.. Then there's the question of jurisdiction..

[2] It's a very common debating tactic to assert that a solution is difficult, to avoid admitting a problem exists.