Some people pay for ads even on their social page, they do pay for those ads so that their content can appear frequently for visitors and also for their content to appear easily on search. Some of them that are making money via freelancing also spent some money to build their page.
That is a common source for the content creators or those page owners that have significant following and have active fans.
It is actually what the advertisers want when there are active people engaging to the posts or videos of these creators. Because the audience is there and the percentage that they can have more users through that is big.
. What I just feel is not right is the misleading idea of gambling that some of them try to pass to their audience.
It's sad but that's how it goes for the creators. When opportunities are touching them, they won't let it pass and they would give some hint to their audience about accepting those offers.