I am not an expert--especially with the newer social media entries--but this sounds sketchy to me. Did you search SA to see if you entered any sweeps for an iphone 12? Or for that company?
For something that pricey, most reputable wins will almost always include an email attachment that includes the rules, any Affy form, etc. If I have any question, I usually search SA for the sweepstakes, google the name of the company to see who they are, google their email, google part of the link you were sent, etc. You are smart not to click the link. I wouldn't either.