What’s the problem with it? Can you elaborate on this, please?
Yes, it is advertising, but it is JavaScript related. And I bet that there a significant number of novice/intermediate developers from europe here that *have* interest in visiting such public trainings.
Aside from that, there are two things I can think of that the OP could have done better: First, choosing a “Tell EchoJS: …”-title would somehow justify advertising things on a news platform and secondly, give at least a discount for EchoJS readers.
YMMV.