Legally yes - just like his first class ticket legally entitled him to better service. But is it right for him to have such a huge influence over the so many people both in Greece and outside. Seems like a single point of failure to me.

I'm just concerned that his unorthodox but popular views offer no new insight in how to solve the problem. If so Greece may doom its people to long term relative poverty and drag other countries along with it.

Time will tell. I wish Yanis, Syriza and Greece the best of luck. Things could still turn out OK as economic predictions are very uncertain. However the risks are clearly huge.