I just took a look a both (thanks for the pointer to seastar! cool project). I'd say "sort of but not exactly". It seems like two approaches to solving the same problem.
Silk seems like mostly a scheduler that uses C++'s native coroutines. Seastar is a future-based framework. Both contain a scheduler and enable async coding patterns.
Well, I too, don't have anything against a company selling a "good but not open printer", and I don't care if my fridge is open.
However, I hope you see that the behavior reported by Jeff here is just bad. They are either not understanding open source licenses or are acting in bad faith.
I had one of these. My account ended up eventually being reinstated. No reason was given for the initial account freeze or reinstating.
One thing I did - in response to them saying I could no longer do business, I told them that they also could no longer do business with me, requested a copy of all of the user data they had on me under CCPA, and told them to then delete all of my personal information.
They did not actually comply and I didn't pursue. I probably should, though.