I've just made a playthrough video and am currently editing a how to play video for my game Robot Rumble. As I am not planning to self-publish, my current plan is to upload both as unlisted videos on YouTube and to give out the links to publishers as I contact them about the game (will be adding these links to my sell sheet).
My question is whether or not it would be appropriate to more widely share these videos as a means to garner publicity around the game while I am trying to sign it with a publisher. I understand that many publishers generally like to sign games which have not previously been published because they want to publish something new, and I have to wonder if widely publicizing videos of the prototype would make these publishers uncomfortable.
Thanks for the advice, everyone! Sending the videos as files sounds like a pretty good way to avoid these concerns that could come up from a YouTube presence. I'll aim to limit prototype info to friends, playtesters, and publishers.
As a follow-up question: Would it then also be less ideal for publishers if I were to maintain anything like an in-depth designer diary on boardgamegeek for a game which I do not intend to self-publish? I am not currently doing this, but it is something I might consider doing in the future. What I have done in terms of social media and game design so far is to mainly post some pictures of a few prototypes with short captions on my board game focused Twitter account.
How much of this question is a matter of the location where the info is posted? I could theoretically post the full prototype rules, multiple videos, a print & play file, etc. to this forum, but if I did it would likely only be seen by people interested in board game design. Would that still be less ideal for a publisher?