Am I entitled to benefit from what I earn from free shopping coupons provided by the company owner, given that it is not gambling?

If the company gives you coupons for prize draws that it sells for a separate price or adds their price to the price of the commodity, then it is forbidden gambling and it is not permissible to participate in it. However, if the coupons are free for everyone, or are given to those who bought a commodity for its price without an increase, then there is no harm in taking the coupon and participating in the draw.