Guys this is ugly to see that you are proving him your numbers for small money.
What if he use the numbers for terrorist activities ?
I know you will say Mobile Numbers are not on your ID .. but you can easily be traced and screwed later if police catches you by IP.
And I cannot understand why someone cant use own number or neighbours number if he is not doing something wrong, plus a newbie account .. moreover paying 3$ rather than asking neighbours for a quick sms code is itself saying a lot

SMS isn't traceable by IP as far as I can remember. It is traceable by geolocation if the user enables the gps option from his/her phone. You're correct, risking your privacy and yourself in the process for a small sum is not worth it (but hey, who doesn't want to get $3-$5 in just a single verification process lol)