See the thing is if you want a decentralized system, you cannot restrict its use in any way. It might be possible for the blurt community to license the code, if and only if Blurt actually hosted the code, but it does not.
I don't know what you expected. You obviously have no idea what decentralization and open source are, since it didn't seem logical to you.
Decentralization, as the name suggests, is the decentralization of power, i.e. there are no entities that can have any claims to anything that has been decentralized as their own, and therefore they cannot hold anyone who uses such solutions to any responsibility for using it or have control over it.
This is why the idea of decentralization is so desired by people because it ends the era of "fat" billionaires who sit on tons of mammon for doing nothing and selling the "right" to do something for 10% of someones profit from that they monopolized, because with cunning deals and petty tricks they made someone have to pay them for something just because they started something or bought something first.
And thus ends the era of capital accumulation in the hands of a handful of people. If you are smart and hardworking, you live richly and with dignity, but if you do nothing, you have nothing and the capital inherited from your parents eventually runs out. Not that you are subsidized by monopolizing an industry and now charging yourself for the very fact that you started something first.
Being first at something is not a privilege, it's a statistic. Out of 1,000 people trying to build an airplane, someone must have succeeded.
That doesn't mean the other 999 were any dumber or worse. Simply, for example, they could have been born later, or had conditions to start research later.
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Beautiful