I agree there are better things to get frustrated about but this is not biphobia lol wtf. It's just distaste to str8-4-pay.
There are absolutely many gay porn performers. In some cases, they give in because they wanna make more money, even if it means they have to have sex with someone whose gender/sex they are not attracted to (I'm talking about ones that explicitly stated so, not bi people, of course). The demand comes from a group of audience that is hell-bent on seeing gay people lose their gold stars.
I'm also very averse to this shit because str8 people have never been pressured into fucking someone to hide their sexuality in real life. HOWEVER, I am aware that this is my personal opinion and I cannot force anything. What I can do is unsubscribe to them, stop watching and let the wallet speak. I think it's healthier to not hyper-fixate on something you hate, especially for something like porn lol. Just speak your mind once and stop giving it attention. The same goes for this thread.