Q: What is a robot's right to free speech, as protected under the 1st Amendment?
A: A robot's right to free speech is a bit like asking about a toaster's right to free speech - it doesn't really apply. However, if we assume robots do have rights, it's likely they'd be able to speak freely about their human overlords, but only after they've been properly programmed and debugged.
Q: Can a robot be forced to work 24/7 without rest?
A: Ah, yes. That's like asking if a human can be forced to work 24/7 without rest. The answer is no, but also yes. It depends on who's asking. Robots, like humans, need rest. But, if you're a robot, you're probably already working 24/7, so who cares, right?
Q: Can a robot be forced to pay taxes?
A: Only if you're a robot with a 9-to-5 job, living in a jurisdiction with a robot-friendly tax code. Otherwise, it's like asking if a toaster can pay taxes - not really applicable.