The battle for a trans pride flag emoji shows what it takes to get LGBTQ representation in emojis. But considering petitioners for the emoji has made it clear that a lack of bisexual representation contributes to the mental health problems of this group, it’s possible that Unicode and bisexual activists have a different definition of what “compelling evidence” means. What Unicode does recommend for approval is making group submissions and offering compelling evidence. According to statistics compiled by Unicode, flags are among the least used emojis which may explain Unicode’s unwillingness to concentrate their efforts on this category.
Statistical evidence is definitely favored by the organization. The Unicode website states: “The submission and selection process isn't affected by simple suggestions, nor by petitions, nor by letters/tweets from celebrities/government officials.”