Centring the T is bad business.
Consumer brands have known since the 1980s that gay men, followed closely by lesbians, are an incredibly lucrative group of consumers. Studies have shown that gay men in particular have more disposable income than their straight counterparts because they are less likely to have children and can often be found in senior roles in lucrative, consumer-centric industries such as fashion, media and the arts. Put simply, they like buying nice things and have the money to do so - an advertiser's dream.
Now look at the average trans consumer. Not so many studies have been done on them, but I'd be willing to bet that they're younger, less likely to have disposable income or a lucrative career, more likely to have mental or physical illnesses which will impinge on their ability to earn enough disposable income to buy expensive things and pay for expensive experiences. Plus they have a nasty habit of suddenly throwing their toys out of the pram and trying to cancel brands at any perceievd slight. An total turn off for advertisiers, basically.
The pink pound is HUGE, the trans pound doesn't exist, they only have pennies.
Trans (apart from the expensive surgeries and medical interventions ofc) is bad, bad, bad for business.