This stream was promoted by Twitch on their homepage, and most of the traffic came from there.
This was a sponsored stream so my client worries a lot about having only 1/3 of what they paid for in terms of engagement, and extension usage 
I will had to stop developing extensions for top tier brands and get back to quick and dirty chatbot if I can’t guarantee a decent reach.
But to be honest, I suspect another problem as it’s the first time that we don’t get more than 90% of viewers rendering it.