It's hard to think big picture when you yourself feel or have been spurned. Even lawyers hire lawyers.
This is a public post the whole world can read. It's now publicly exposed to thousands of readers. Most of which don't know him and are now getting a first impression.
This doesn't put him in a position to gain anything. Even if his critique of udemy went viral and was taken in the most positive way, his reputation as a programmer and video content producer is damaged since he's seen as a spurned advocate.
This is why Europa is so stoked on the "right to be forgotten".
So many times we see a person who has dreams, but their temporary disagreement and power struggle personally ends up damaging their reputation. They are cast aside as trouble makers, and when it comes down to the decision of whether you want to work with someone, people's biases will tend to pick someone who won't potentially cause a stir.
Their "15 minutes of fame" deafens future attempts at them building their identity and reputation in the field they want.