Can H-4/F-2, etc. non-work visa holders volunteer?

Please visit my LinkedIn article posted this morning for a brief explanation on this issue:

https://www.linkedin.com/today/post/...?trk=prof-post

• General Nonimmigrant Visa
• F Visa
• F-1 Visa
• F-2 Visa
• H Visa
• H-4 Visa