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It will be more successful if you have a YouTube channel or any social media platform where you can attract your followers to gamble.
Anything that a person think they cannot earn with it since they are lazy or being shy to share their referral link think that its just a waste of time if they do that. Maybe they are not really interested about it and just share their sentiments to the people who can read their statement. But if they do a lot of efforts and share the links of legitimate casino's or other platform they can possibly earn decently with it especially if they can convince whales to register under their links.
getting a "whale" who uses our referral link is a big fortune that rarely happens, as many people have said that there are many rich people out there who only rely on their income from referral links
(whether it's a referral exchange link or a gambling site or project others) that they distribute regularly. there is someone that i have seen on YouTube, who explained about the 5 side income that he did and spreading referral links is one of the things he did, he also showed how much income he got from the results of spreading these links so there's nothing wrong with spreading your referral link to the general public.
Rare to happen but if you are active in gambling forum then earn some influence on gambling scene maybe you can accumulate them especially if you are sharing tips that can catch up some peoples interest then high chances that you can invite people to sign up under you. But if you are just sharing it randomly without getting in touch with the players you want to target then maybe you cannot get them and only small gamblers will sign up your link just out of curiosity.