I did something similar on Quora. Since I'm a published author with books on the market, I would seek out questions from (novice) writers regarding problems they'd encounter writing, for instance, dialogue. I would give some pointers and then show how I used them by quoting a scene from my own books, with underneath my name and the title of the book with a link to the book on my author website, where you could find more info about books including links to retailers.
I know that I sold books if the answer was upvoted and my sales went up even more if my answer ended in a Quora Digest email sent to 1,000 or 10,000 members. I could see that my sales increased mere days after posting these answers and sharing them to different Quora groups.
Helpful as my answers were, there was still an element of indirect marketing and promoting my own work. I was aware of that, but there's no violation of rules to use this kind of 'soft' marketing.
Although you might have 'good' intentions, posting a link to your YouTube channel generates 'views' and even 'likes'. If your videos get lots of views, you can sell advertising space in your video and that means financially profiting from posting the links.
If this forum doesn't allow you to self-promote your business and you're claiming that you 'just post the links because they explain your point', you are being deceptive in your motivations.
And that, in turn, undermines your integrity and ultimately your credibility.