Your choice of establishments do not disprove my point. Most are breweries, which don't have the typical sit-down type restaurant experience in which a tipped position is most common/expected. But, nonetheless, I looked at each one.

• Deadhorse Hill. Eschews voluntary tipping for a set 20% service charge. This is just tipping with another name.
• Armsy Abbey. No mention of tipping policy on their website or menu. Perhaps they do in person.
• Wooden Bar. No mention of tipping policy on their website or menu. Perhaps they do in person.
• Fox Farm. Does not have food.
• Jewel Box. Permanently closed.
• Maine Beer Company. Does not specifically call out tipping policy, but notes "All contributions made above and beyond your final check will be donated to nonprofits," suggesting that tipping is not expected. That's pretty cool. Also appears to have counter, not sit down, service, and a very limited menu.
• Novare Res. No mention of tipping policy on their website or menu. Perhaps they do in person.
• Treehouse. No mention of tipping policy on their website or menu. Perhaps they do in person.