Earning Bitcoin is an opportunity to hold and make a profit from it. I have seen many posts by some newbies where they ask how they could earn Bitcoin by offering services. But just like every other work, you have to put enough effort into building your account to join a campaign. Even when you join a campaign you are still expected to fulfill your obligation to the satisfaction of the campaign manager and the organization are promoting. You might be able to join any campaign if you don't put effort into your posts to get merits to build your accounts. Your perception that it is free or cheap money is not true because you still need to put in a lot of effort before you can be able to earn some SATs.