if it's not on the "business" side do your due diligence... even on the business side, but way less likely someone pays the fees for that type of account to cheat people, lol.
Free seed, light sponsors, fertilizer sponsor and some other stuff is possible. Not too often when they pay you just to grow the weed, though i have heard of it.
Would you do it anyway? then it's a good deal. If you don't want to grow the stuff they choose to send you, don't do it. that's why i stopped taking the free stuff. They only sent me what i wanted 1/2 the time and most of the free seeds are solid mid-grade quality at best. Your best hope is to find some winners and breed your own, seriously.
The last 3 years the best plants in my garden have been an F1 fem seed i produced from 2 really solid plants with similar characteristics, but different family lines. the progeny is more robust and consistent and retained all the frosty goodness of both parents. The slight inconsistency of flovor is even a positive for me. The structure is incredibly consistent in them which is also a huge benefit.
Start finding winners.. even in midgrade seed you run across 1 out of 10.