why is it called bipoc for inclusiveness

so this may a stupid question and i will front this by saying i am in full support of the gays and also people of color but it seems quite strange that there is a single term for bisexual people of color and not for any other people on the lgbtq spectrum again please let me know if there is anything i am missing here but i am in a lot of lgbtq spaces and i see a lot of biopic this stuff and i don’t understand i asked and no what it is