I suspect that the probability that these GOTD or other "giveaway" special offers ever really gave anything away which didn't seem to be obsolete, twisted or sans hooks would be very small.
GOTD was the first such site I found and I cannot remember the last time I looked at it.
In general I disagree with your comment but having said that there is a lot of rubbish out there and a lot of dubious giveaways.
The answer is to be selective. Is the software something you would actually use? If it is an older version is it still worth having? Is the license full and permanent?
If the answer to those three questions is yes you move on if not you leave it.
What information, if any, are you asked to supply? Many giveaways do not require any. Some just ask for an email address to send the license details to.
Even then, if the software is really worth having there is still no need to give your 'real' details. The only time I ever do that is if I am buying something.
The final question, is there a freeware version that is as good or better? I have found a lot of good software by asking that about a giveaway and following it up.