Or are they a product of digitalization of writing, where we shorten everything?! "Love Experiences?" "Like Bonuses? Get more Rewards and Discounts" ...can one use these statements in writing or would it be considered grammatically incorrect?
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As a matter of fact, you can see this kind of syntax/wording quite often. That's informal but can be used and is used quite a lot on websites, leaflets and so forth. Just think of "got it" (cookies notification bar), "will do"...etc The subject is always implicit. We all know it's not formal but it's used on a daily basis. As a rule of thumb, I'd say the English language is rather flexible about this sort of thing.