Whaleshares is its own own platform with a chain. The below picture shows a statement about Whaleshareos on Gitlab...

I am being told by one Whaleshares user it is not a fork of Steem. I do think it is a fork of Steem, but seeking clarification on that.

In the future it will be handed over to the community in the form of a DAC. Here is the first WP if you like to read it.

https://whaleshares.io/whaleshares/@officialfuzzy/-the-whalepaper-1st-edition-20180908t175717325z-post