Yes, it is. Apple's fight with the US is based on the fact they facilitate the encryption of user data so that even Apple doesn't see content.
When the other titans don't have that feature, they have less of a stake in the argument at hand.
When the other titans don't have that feature, they have less of a stake in the argument at hand.
Their business model is to sell ads to 3rd parties based on the information they have about you. Selling your info itself would be detrimental to their business.
Google's targeting would be less effective if they gave everyone PGP keys and locked themselves out of the conversations they host.