It was an mistake you did. OSM should be under cc-by-sa and not under this new licence.

it is not up to others to judge on hackery's decision.

Olli17, any better arguments than "should be"?

My personal view is that I want the data I contribute to continue to be available and of use, even if the worst were to happen, and OSM were to disappear, so I opted for PD. Yes, some people might then try and sell it, but there's more chance others will continue to provide it for free so they will be less successful at this.