Rainbows are ultimately a Western symbol of queerness. There wasn't an international queer conference where queer people from all over the world voted on rainbows as an international symbol of queerness. The rainbow flag originated in San Francisco during the late 70s where it then spread to the rest of the US and later the rest of the Western world. It only penetrated the non-Western world through Western-back NGOs.

This is the problem with pinkwashing. Non-Western queer people are essentially set up to fail by Western-back NGOs, making them entirely dependent on those NGOs. You can see this in the way some Chinese enbies use TA pronouns instead of using or inventing a Chinese character as their pronoun. If you're a queerphobic asshole who thinks queerness is just Western d-word, then a bunch of enbies going around using the Western Latin alphabet instead of Chinese characters to describe themselves would pretty much confirms queerness as Western d-word. This is not the fault of the Chinese enbies, but the Western-backed NGOs who purposefully push the idea of using TA as a pronoun knowing that the more reactionary elements of Chinese society would weaponize this to push queerphobia, further pushing those enbies into the arms of the NGOs. The NGOs want the enbies to be estranged from mainstream Chinese society and are taking advantage of queerphobia to essentially groom those enbies to become potential Western agents of color revolution.

Queer people have existed throughout history and throughout every single human society, which means people don't have to use a foreign symbol with pinkwashing baggage but just need to uncover the queer history of their particular society and use those symbols instead.