As for an intial starting point, it makes sense that you are looking to capture users that have been kicked off places like Reddit, FB, or can't participate on Parler any longer and I'm sure you will have success within that target group if you are able to get this off the ground. However, I'm not sure where you're going to get new users from after that - and without a more diverse user base, you are not only limiting the spread of ideas from your platform to elsewhere but are also creating an echo chamber where people who self-select for "my views are not tolerable in the mainstream" are the only ones who are talking. This problem will get worse over time, and make it even harder to attract new users.
Like you say in your blog post, a major source of frustration with existing technology is that "They prefer purity to practicality". It seems an awful lot like you are trying to do the same thing here, and while this project will certainly be entertaining, I'm not sure how viable this will end up being - I'm having a hard time seeing this as anything other than another Voat/Ruqqus.