They don't want to become the next Gab. They want to stick around for a while and become a force amongst Cons. They were trying to bribe liberals to show up (if they had enough followers) but reneged on that. My guess is within 3 months they will back down from their "No Bots" mantra.
The problem they have is that it is 95% Cons many of whom post on other social media. Right now it is fun because they have Qtards and Trumpublicans running wild with stupid conspiracies and hope that Jan 20th will go their way. When it doesn't (because the Real World /= Parlerville) they are going to have a lot of issues. First and foremost is that Cons will get sick of just yelling at each other. They can go do that on 8chan or whatever the hell it is called now. They can't just discuss things in a vacuum their whole ideal is to troll the Libs. So they will split time with other SM slowly walking away from Parler because it gets boring. (there is already complaints of that) The ones who don't will be the violent ones and, much like with 4chan/8chan the more they talk to each other the more militant they become. Sooner or later, just like with other Con SM someone will do something violent and it will be traced back to things they said on Parler. This will then cause the "Influencers" on Parler to flee to not be associated with it. Parler then becomes the next Friendster...