This is awesome.
I was actually saying yesterday “it would be nice if we could share this externally, just like with documents” 
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However, I can’t help but notice a bit of a sleight of hand happening here: shared whiteboards do not have the sidebar. I’m actually a fan of this as it relates to the Public spaces and tenant separation issues I ran into.
If we could get a similar option for sharing documents (without the sidebar) then it would solve a lot of complications for companies stuck in a similar situations with ours.
We could share a public document with each tenant, there will be no sidebar so none of the tenants would see each other, and then we could embed views in that document or link to the publicly shared whiteboards.