Evidently Truth Social is AGPLv3 open source (based on Mastodon) and publishes their source code here: https://help.truthsocial.com/open-source

Wikipedia says "...initially did not make its source code available, violating Mastodon's AGPLv3 license. After Eugen Rochko sent a formal letter to Truth Social's chief legal officer on 26 October 2021,[57] Truth Social published its source code on 12 November 2021." https://en.wikipedia.org/wiki/Mastodon_(software)