“Based on the screenshots I have seen, it absolutely is based on Mastodon,” Mastodon founder and lead developer Eugen Rochko told Vice’s Motherboard in an email.

The underlying code can be used by anyone — providing users comply with Mastodon’s licensing requirements, which doesn’t currently seem to be the case in Trump’s venture.

“Social networking, back in your hands,” touts Mastodon’s website. “Publish anything you want: links, pictures, text, video. All on a platform that is community-owned and ad-free,” it adds in operational tenets that seem far from the world of Trump businesses.

The Trump network TruthSocial.com appears to have helped itself itself to Mastodon code while also violating its licensing requirements. “The main part of the license is making the source code and any modifications to it available to the public,” Rochko told Motherboard.