"Become" here means it only counts if they switch from being non-vegan to being vegan, not if they were already vegan at market creation or taking office. Returning to veganism only counts if they were non-vegan for >1y.

"Vegan" here covers both identifying as such without the actual lifestyle changes and making the lifestyle changes without identifying as such. Trace amounts of animal products in goods and services they purchase or use are allowed, but it cannot account for >1% of product mass, volume, or surface area. Unknowingly or unwillingly using animal products does not disqualify them.