Simple as that. I won't go deep into a socio-political rant here, but Patreon has some shady business practices and I refuse to support the company. I'd like the option to donate in a way that doesn't rely on that particular company.
Though I don't know anything about this "shady business practice" I do like options. I haven't money to give but if people would rather another option, I always support adding more options so that things appeal to more people.