Let me get this straight:

* I create a dataset from public data sources, e.g. a list of roads, and
publish it under the Public Domain dedication (i.e. CC0).  (I agree that
MIT is weird here).
* Afterwards, I make a subset of my original data by removing any roads I
found elsewhere, e.g. in a proprietary source.
* And now you are saying that the new _subset_ of my original public domain
data is no longer public domain because I removed values that exist in a
proprietary source?

I think this is taking it a bit too far, but IANAL... You are obviously
welcome to take it to court, but I think it will be a breach of trust if
OSMF would spend donated funds on fighting windmills. If anything, it will
stop any serious organization from ever touching anything related to OSM -
as they would never know what lawsuits might be brought up against them,
thus effectively killing OSM.

I feel there are some members of OSM community that ideologically opposed
to Facebook in general. I can understand that position, but I don't think
it should affect our judgement of the actual contribution, which only makes
our data better. The last thing we would want is for OSM to become a legal
minefield.

On Thu, Nov 14, 2019 at 3:47 PM Mateusz Konieczny <matkoni...@tutanota.com>
wrote:

>
>
>
> 14 Nov 2019, 21:38 by r...@technomancy.org:
>
> Facebook provide download dumps of their machine detected roads on a
> country by country basis
>
> IANAL, but as far as i know you are
> 100% right.
>
> Also, is their road detection powered
> by already mapped OSM roads?
> In such case it would be ODBL even
> before substraction of what is in OSM.
> _______________________________________________
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>
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