I am a nonprofit CEO who’s worked in community, sport, educational and health charities.
Organizations and causes require people who work full time to help organize the charitable work. It is very difficult to find people to volunteer at this level and typically if you do, they are independently wealthy. Retired people can do more but typically they do not want to give that much time and have other things they want to do.
4 hrs a week which is a typical volunteer shift at our hospital does not lend itself to pulling all the details together.
Good people deserve to get paid to do good work. Just like in tech, you get what you pay for. And typically a nonprofit worker puts extra hours and time in as does their family members in support of the cause.