Probably OP meant that going for gambling by the rewards he will be earning from staking EOS and TRON.
Moreover, he must be emphasizing about "free way of gambling" by considering staking rewards similar to freebies.
Edit :
There are casino dApps in the TRON network that wagering works like mining. To be more precise, the online casino rewards you with its coin for placing bets there. When you freeze their coin, you are eligible to get dividends.
I just came to know about these dapps based casino and the features of wagering based mining. It seems like something new and exciting feature, every gambler will be looking to check at least for one time. Thanks for enlightening me. I'm just going to check what is it and how it will be. After checking out, let me share my experience here in more elaborated way.