If Windice do choose the other non-good entries rather than on that better one then it would really be a questionable thing on their part.
Based on past works of Windice team so far, I don't think they will choose bad quality videos. They pay for such Video contests, 0.1
BTC is not a small money, and the team actually care more about quality, even with signature campaign, they care about quality of their participants' posts, so I don't think that with the high prize contest, and important channel to spread Windice out through videos, they won't care about quality. This is somehow opposite to all Windice team's marketing approach by now.
Windice made a video contest and the prize pool is too good for participant its obvious they will choose a good quality video content for the way to advertisement of their site.
As of now, I am only seeing a small number of participants who are posting in windice forum. The prices are reasonable, When is the deadline of video contest?
You visited the forum of winfice but not seeing the instruction regarding the duration of the video contest? Okay just see this for the information if you are interested to join.
The contest will run for 2 weeks , from 05.05.2019 to 19.05.2019
The minimum number of participants is 15.A player can have more than one entry, multiple entries increase your chances to get a prize (but try to focus on quality rather than quantity)