Yes, in capitalism, anyone has the ability and capacity to say no. When you reach a point of economic stability, you are free to chase whatever dreams you choose. If you want to live off the land, go ahead. If you want to invent something that will improve the well being of billions, go to it!
If you want to go vegan and never harm a sentient being, go do it. There is nothing to stop you.
Capitalism is creating new wealth each and every day. As we become more wealthy, our ability to do things grows. It is a self reinforcing cycle. This is how we have destroyed famines and extreme poverty from almost everywhere.