On Earn.com you can earn bitcoin by replying to emails and completing tasks. You can keep the money, or donate it to charity.
Only by setting up your account, you earn $1 (0.0001564 BTC, $1 = 6,395.14). In addition, for each referral, you earn $1.
So, you may think: let use the referral link with 100 emails to obtain $100.

Why mass referral is not possible:
- You can’t cash out anything if an account is not verified.
- You are not receiving any referral if the invited user is not verified.
- To be verified you need:
– A work or school email;
– Connect LinkedIn account with over 50 connections!
– Connect Facebook account;
– Connect Github account
Conclusion: do not loose your time trying this strategy!