Hello @transisto,
thank for the compliment.
I thought first about doing a voice over and talking with the cartoon maker but it would have been complicate to do it myself and keep the "cartoon voice " of the movie. So I decided to subtitle only.
And for the other Promo-Steem video, I also asked the film maker (already at Steemfest last November!) but voice-over should be organized by him and he would hire a professional for that only if it's financed from Steemit (as I understood this video has been financed by Steemit Inc).
This is why I sticked to the subtitles.