Do you think that sweepstakes, put on by major companies and brands, are legit?

Or do you think they have a designated winner before hand that just accepts the money and returns it to the company. Or do they even go through that much trouble?

Do you think that sweepstakes, put on by major companies and brands, are legit?
Publisher's Clearing House is one example. They have been around for decades and do award prizes. None have a designated winner. They either select the winner (s) from entries selected or don't select one at all (total scam).