Thanks for the connections. I do not consider sharing shortening links in the forum. I think sharing on social media.
I studied the sites quickly. I guess there is no content restriction. Do these companies pay within the links of adult and pornographic content sites?
You need to check their terms to publish adult related content because some of them many not accept adult content. If you have some good content and sharing for free in any other forum, then people may visit these kinds of links and ready to wait for advertising timers to finish otherwise many people may not visit these links.