Wow, there are a lot of free-spirit rebels in this forum
"Hey man, why do the imperialist corporations want to co-opt my phone, man? Don't they realize that wireless phones don't have wires because they need to be free from all that heavy stuff, man?"
Sure, it's nearly impossible for the small developer to get on the SPV right now. Yes, Orange should have had developer support in place at launch, but it is supposed to be coming soon.
A locked device has big advantages in protecting customers and Orange from poorly behaved apps pasted together by weekend developers. There are some very good games available now for the SPV. The vast majority of users will get along just fine without a variety of $5 tile puzzles.
The game consoles are locked. Who complains about that? The warez guys maybe. The developers for those platforms are happy they're locked.
Devices can be corrupted by even well intentioned programmers.
App signing can improve reliability and simplify customer support for any computing platform, especially one that is primarily supposed to be just a phone.