When just 1% of the population pursues vegan eating, your market niche is too small: Popular vegan restaurant chain closes after angry customers mercilessly attacked it for putting meat on the menu
The restaurant added meat dishes to appeal to a larger market but militant vegans forced a shutdown of the restaurant, putting everyone out of work. The owners had previously sold their own home to raise cash to try and keep the restaurant running.
The vegan community behavior is likely to discourage others from opening up vegan/vegetarian restaurants in the future.
Everyone ended up losing.