Is the 250 free grocery gift card a scam?

It's not a scam it's a hassle. If your willing to jump through the hoops you'll get the card.

By "jump through hoops" it should state - fill out a ton of survey information, then be required to select at least 6 (yes six) promotional offers, most of which cost money, most of which are a scam. And, after clicking through to the end and hitting the "finish" button, it went to a "page couldn't load" page that in essence, most likely proved the whole thing really is a scam. Even if legit, certainly more than just "a few hoops."