I got more confidence then most on this offer and Im familar with UK law and regularly see details similar to this scheme advertised privately. This doesnt mean you shouldnt use your own judgement but I'll clarify stuff if I spot a common point between these types of raffles:
At first they said that it is free to join or you can join by paying small amount to the raffle.
So this happens all the time with UK 'competitions' usually its phone in with an answer and we'll pick from the correct entrants. Whats all the colours of a rainbow? or whatever simple question you can think of.
The catch is to phone with your answer you phone a premium line and this is all advertised, basically this is your entry fee and maybe its below 1 dollar worth roughly.
Thats all 'legit' and normal practise. Its a question because its not offically a raffle, its a skill based quiz and then its a raffle. But you know, its basically a raffle and ditto the lambo is basically a raffle with a question.
However the free part is derived from this, anyone can enter this raffle free, they can not phone in the answer for my example but instead send a postcard with the answer written on it. A free entry is possible in this way, this is a requirement legally to proceed. Ditto the Lambo comp is letting people enter freely if you really want. Its not a big deal as to have much of a chance, you probably needed like 10 or 100 tickets anyway and I believe free entry is just once.
Thats who runs it and to my surprise its just run under common law with no registration which makes the idea quite prone to spoof as is the meta on the internet, be careful then. Also UK law as mentioned on one of those links given in the small print I post below
Most of that is regarding tax law because the rest is quite unregulated which explains why 'normal' individuals are popping up to do this. I do really recommended you find who the promoter is and are comfortable with the law of the country they are a citizen of (not just occupant)
This explains why it manages to avoid gambling laws