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But it comes down to what I said, Propolis is a wiki which utilizes the Hive blockchain for data storage. It's not entirely focused on Hive, although it will be filled with content about Hive.
That's why we don't use Hive colors.

I see, I thought it´s aim is to be a wiki about Hive. Ok, in this case of course makes no sense to use the Hive logo.
But what is then the aim? To compete with Wikipedia? Why would someone use propolis if nothing is there, and even if all Hivers write one articel for propolis per day for a year, we still would have only a fraction of the volume of wikepedia!

It doesn't make sense to compete with a giant like that. Wikipedia's relevancy rules are very strict, and there are a multitude of other reasons besides that why people might not want to use it.
If we're looking for competition, I'd point to https://iq.wiki/