creating video content for YouTube or so on is not more difficult than trading, i know there are some influencers who don't make anything from trading but only make money from affiliate rewards that they distribute through their content links. Just pay attention to influencers who diligently upload videos on all their social media accounts, do they have time to trade? Trading is not an activity for 1 hour or 5 hour, but for many hours. Apart from that, when you are tired of trading, you still have the enthusiasm to make videos! their work is purely as content creators, they only use their trading activities to attract viewers to register through their affiliate links, trusting them is fine but don't trust them 100%.
I think trading is a hard job, but making a video to tell about trading is even harder. Yes, it is true that there are many YouTubers who do not earn from trading but from paid promotions, or rewards. I think YouTubers who create and upload videos on YouTube and social media accounts on a daily basis do not have time for trading.They only report daily news that promote a project or tell about investing in top coins.
However, there are YouTubers who invest and trade themselves and make videos every few days to educate people about trading or investing,but majority are people who have good followers and on the basis of large number of followers they are hired by various projects to attract people to their projects which they reward them for free.
You are right that there are some of them who also register you with various exchanges through their link, which gives you a discount on trading fees on the exchange. I think no one will be motivated to make videos after getting tired of trading because it is a hard work and tiring job. However, all people talking about trading on social media accounts should be watched, as we can get good experience and information from them, but the decision should always be our own. Trade should be done after doing our own analysis and research.