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Imagine Bitcoin developers started changing BTC open source code to CC after first shitcoin forks showed up 
That wouldn't be possible there are thousands of contributors, all would have to agree. CC is largely single source (us), the very few external contributors had no objection.
The cloners were very careful with their github tricks, but regardless think what you want.
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Someone could correct me if I am wrong, but I think that you also didn't release your Seed XOR (version of Shamir Secret Sharing) as open source, just showing how wrong your thinking is.
But hey, do whatever you think is best for your product, if you are selling better than ever like you say, you have nothing to complain about.
But hey, do whatever you think is best for your product, if you are selling better than ever like you say, you have nothing to complain about.
We have a ton of FOSS work done, funded and contributed, under many different licenses.
Regarding the SeedXOR, XOR is standard computer operation not much to license not license. Within 2 minutes I was able to find implementations on github https://github.com/Marcaday/SeedXOR
All the instructions for you to implement are here https://raw.githubusercontent.com/Coldcard/firmware/master/docs/seed-xor.md
You and I are free to choose your licenses for your project.