Ominous that the social networks are splitting along these lines
Parler's growth is happening directly due to the impact of the election, and Twitter adding disclaimers to claims of ballot interference. It won't continue at this rate, because besides political kinship, there is nothing there for users to do. Nobody enjoys the political zones of Twitter, unless they're 'dunking' on the opposition. On Parler, there is no opposition.
Split into two separate social networks dramatically increases the echo chamber effect.
e.g. on reddit someone from /r/conservatives might still interact with /r/liberals because they both have an interest in /r/succulents
They may not be speaking about politics but they're still interacting. If you're on two different platforms even that minor overlap falls away & that allows for the two to drift further apart and harden in their views