Earlier quoted context omitted.
It's possible to focus on free speech without encouraging white supremacists. That doesn't seem to be Gab's goal.
How, I would love to hear solutions. People like asparagirl will not join a free speech platform because her speech isn't really restricted from the non-free speech platforms. The people who have the biggest incentive to join these platforms are the one which are kicked out from all the other networks.
As to these platforms: the whole argument is essentially build on this slippery-slope fallacy that banning vile racism, anti-semitism, etc. inexorably leads more restrictions on speech, and (eventually) the end democracy.
That's demonstrably false: there have always been restrictions on speech (such as obscenity laws), so there really isn't some bright red line that would be crossed, and these restrictions have also not lead to the end of free speech.
There are restrictions on almost any other activity if you expand your definitions to the extremes: the right of peaceful assembly is just as central to democracy, but nobody is bothered by the restriction that you can't hold your protest in the Oval Office.
So maybe these people should consider being kicked out of all these platforms not as an incentive to change platforms, but to rather think about how far they must have removed themselves from society. Seriously: if the people who think youtube comments are worth it ban you, it's time to start listening more and posting less.