It's no surprise that people banned from other platforms end up on a platform that accepts them. That doesn't mean Gab was specifically made to promote any specific group or viewpoint.
> "Gab welcomes everyone, but sees a unique opportunity to carve a niche in a massively underserved and unrepresented market. We estimate that there are over 50 million conservative, libertarian, nationalist, and populist internet users from around the world who are seeking an alternative to the current social networking ecosystems. These users are also actively seeking out alternative media platforms like Breitbart.com, DrudgeReport.com, Infowars.com, and others," Gab stated in a company filing dated July 11, 2017.
https://www.cnn.com/2018/10/30/tech/gab-anti-semitic-speech-...
This is in addition to white supremacist statements made by the company's official social media accounts: https://twitter.com/ClenchedFisk/status/1027690034718224384
And white supremacy is more authoritarian than libertarian. And it's not conservative in the current political sense and it's populist.
I'm not sure what to make of that Twitter link except that there's a whole bunch of folk so embedded in their own political bubbles that they're incapable of communicating with anyone beyond.
[1] https://www.buzzfeednews.com/article/josephbernstein/heres-h...
[2] https://www.revealnews.org/blog/the-hate-report-infowars-is-...