These platforms exist for the purpose of capturing content that has been “deplatformed”.

>Speak freely and express yourself openly, without fear of being “deplatformed” for your views. Engage with real people, not bots. Parler is people and privacy-focused, and gives you the tools you need to curate your Parler experience.

Parler frontpage.

They have no intention of creating a real alternative to Twitter.

Lets be honest here, It's not like you can't have a conversation on Twitter either if your views are alternative. It's their hateful, harmful and offensive comments that will get them "deplatformed".