@matigo: you didn't really get an answer to your question is 10C a silo.
I'd say it is, mostly, but not an evil silo. All our data are here and I believe we can retrieve it all. But although one can POSSE from here, there is no backfeed. Also, at present, one cannot do likes, reposts, etc for material outside the silo.
Unlike other silos, 10C does not object violently to those things being doable. It just doesn't do them. Yet.
One thing is that without a plugin architecture, I don't know whether others could help. I also don't know nearly enough to know whether the API would allow people to make apps on top of 10C that would be fully #indieweb.