Note that I attempted to remain as objective as possible. The former doesn't mean you should use GPL, it's just important to keep in mind when deciding whether or not you want to use it.
There's some ethical aspects involved there too since it's not algother hard to recognize similar strategies in patent pools by MPEG LA and such and GPL licensed software for GPL community.
The thing is whether one believes the cause is important enough to justify the cause when it comes to ideology. Is it okay to gather big enough an arsenal of IP that GPL community can force other people to join in the GPL community if it furthens the cause of opensource code? What if it's another opensource project that's just using GPL-incompatible license?
Whoever fights monsters should see to it that in the process he does not become a monster