[Jaggzer]

90% are Scam, you give them your email and they spam you with ads.
The design also looks always the same on those sites somehow xD.

[Zrek721]

There may be a few legit giveaway. But mostly, they are scams, nasty people behind there too.

[docvd]

if something on the internet is free, chances are good you are the commodity.

[laininthewired]

99% are scams to collect your info.

[jacob96]

they just sell the data that you enter, so it is indeed a scam

[jdoe71]

Even the best ones are like a sweepstakes, no purchase necessary but give us all your data and you "might" win the "grand prize".

[Spooky]

I would just assume it’s a scam. I would even assume big companies do giveaway scams all the time.

[astrogen]

Those are all scams, don't even bother visiting those sites.

[Equinox]

I would personally never trust a giveaway site, especially when it asks for any sort of personal or private information. More often than not there's something fishy going on there, and it's probably a carding site.

I would like to take this time though to tell everyone that I'm giving away an iPhone 12 Pro Max, brand new never used. Just private message me your full name, date of birth, social security number, and shipping address and I'll get it to you right away.

[Hysho]

Any site that promises to give you something for free is most likely a scam site. You'll most likely be paying with your information.
When I was younger I used to fall prey to these scams. I never had my own number so I used my Mom's but she still gets texts about me 'winning' these scams to this day.