"Unlimited" is a marketing term with a very specific meaning. It means "limited".
"GMail offers unlimited email storage, I can encode arbitrary data in an email. Therefore GMail offers unlimited storage! Wait, they banned me? HOW DARE THEY, FALSE ADVERTISING!"
Where back in the human world its not ambiguous at all what what Google, and every other service ever, means by this and is completely correct to call it unlimited.
Marketing does not create reality, no matter how much marketers may think otherwise. Words have meanings, you can't unilaterally attach some new one to a word and expect people to agree with it.