Good deal don't listen 2 the haters!!!
Who's yelling? Beta key is nice and all, but they're taking the mick trying to get two birds with one stone. "check the stability of a new game + gather an audience AND let us stick you on our advertising list". No thanks.
You can always use a temporary email address. Mobile phone is not required too so use a fake one. Alternatively, you can choose to be the one who yells in comments. (y)
"Get this free* piece of advertising by signing up to our free adverts!"