The problem free speech message boards will always have is that the only people who seem to be genuinely motivated to post on free speech platforms are people who can't get on normal platforms. As a result free speech platforms almost always end up dominated by extremists and racists. Partly because they're the ones with the biggest motivation to use the platforms, but partly because their use of the platform drives away more moderate users. Plenty of people believe you have a right to free speech but also believe in their own right not to hang around and listen to you.