WordPress co-founder Mullenweg cautioned that the FAIR project's distributed plugin and theme repositories could undermine WordPress.org's ability to manage trust and reliability

Fairly sure that Matt Mullenweg has already completely undermined Wordpress.org's trust and reliability.

Well, yeah. Isn't that the stated goal?

Eliminates reliance on any single source for core updates, plugins, themes and translations, enabling federation across the ecosystem from trusted sources

[...]

Brings together a fragmented ecosystem by bringing together plugins from any source, not just a central source, while creating a foundation for modern security practices.

Builds security into the supply chain, including improved cryptographic security measures, enhanced browser compatibility checking, and enabling reliance on trusted source security salts.

Linux Foundation announcement.