I earn nothing from gambling.
I lose on gambling.
You cant earn stable income from gambling.
I think on sportsbet is possible to win some money.
Yes if you use the free bets, there is certainly some money to be made. on sports bet.
There is no limit though.
Some people earn a lot 1 day and lose more the other day.
This is true about free bets.
But:
1. You need to live in Class A country (Western Europe mainly)
2. You should be prepared to send all required documents from all bookies (ID, Driver License, Utility bill/s and so on). So forget about anonymity.
3. Still BTC bookies are offering mainly casino bonuses.
The plus side - you could easily make 1000+ euro per document set - you, your grandma/pa, cousin and so on...