Contributing to free software requires privilege. Even regular contributors might sometimes find themselves without it.
Time, focus and money. You might find yourself lacking in one of these at various points in your life.
While software projects from startups move like streams, most free software projects move like glaciers. They move slowly but they keep moving for decades.
Being away from a project doesn't mean you have to give it up. You can join back later.
It's very unclear to me what you mean and what you are implying with the word privilege in this context.
Stating that something is free software and that patches are welcome is a statement of fact. I don't see anything wrong with that.
The flipside of this lecture in privilege is one about entitlement. Nobody (outside of my immediate family) is entitled to my time and energy in order to fulfill their needs, no matter how "privileged" they might think I am.
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