My theory is even right wingers hate right wing cesspools. Like there is no shortage of far right communities on the internet, but even if you were to be a right leaning person who has no problem with "a little free speech", you are going to be a "cucked liberal" to someone else. Maybe you are a fiscally conservative hypercapitalist but have no problem with the existence of gay and trans people. Maybe your a terf but still care a lot about abortion rights and access to healthcare. Maybe your extremely religious, but believe it is your duty to help the poor and provide charity for those in need. You are going to clash with someone in the same space as you, and there are going to be fewer protections from harassment and less places where you can feel safe in speaking than if you were on a more mainstream space with actual moderation. In the end the platform is going to be hospitable to only the most extreme of conservatives, and its going to become an echochamber of the same opinions, and the same hate and anger.

Second, most of these accounts and groups have the goal of recruitment in mind. You're not going to recruit many people in the far right echochamber because your basically preaching to the choir, so instead you go to the platformers where all the "normies" are at. There you can spread prop, pick easy fights and make your side look strong, and convince ordinary people that what you believe isn't all "that bad", or that it's the liberals/trans people/feminists/jews who are the disgusting or unhinged ones.