Think of it like Internet.
Tim Berners-Lee could submit patent applications and be much richer, but he wanted everyone to use the Internet.
Satoshi could choose a strict license, but then there won't be that much users and merchants, and only one client. 3-4 devs, editing code would be illegal. This would cause node centralization and if an exploit was found an attacker would illegally change the code of the client and make 51% attack easily.
Main idea: Satoshi wanted everyone to use bitcoin, and allowed everyone to change the code that they're running. Thank you Satoshi for BTC freedom!
And now, they can't change the license, but you can be sure that if BTC had a strict license, the attackers (IYO) would still use changed code client with TOR and no one would be able to stop them.