While I'm sure that Google is writing Fuchsia in part to move away from the GPL, there are very good technical goals that Fuchsia accomplishes that Linux does not. Because Fuchsia is based around a microkernel, it offers much better security guarantees than Linux ever could. Almost everything from device drivers to the TCP/IP stack is a "normal" process in Fuchsia. If there's a security vulnerability in the TCP/IP stack or in a device driver, even if it's an arbitrary code execution vulnerability, it's much harder for an attacker to move inside the system. If you constrast that with Linux, if you compromise _any_ subsystem or _any_ device driver, you're in. And this is an inherent fault/trade-off when you select a monolithic design like the Linux kernel does.