I think the question to be asked with all backformed verbs — fragmentate, benefact, gift, etc. — is how does a new verb formed from a noun differ from the original root verb? What does gift connote that give does not?
One argument is that gift has a limited legitimate use when it refers to a large donation left by a benefactor. For example:
The new wing was gifted to the hospital by the estate of John Q. Smith.
For the most part, though, gift, as a verb, is just a meme — a mind-virus that has infected the language through unreasoned repetition.