From this write-up: https://knowyourmeme.com/memes/events/gamers-nexus-vs-linus-tech-tips-billet-labs-review-controversy

A major concern Gamers Nexus highlighted was Linus Tech Tips's June 24th, 2023, review of a product prototype by Billet Labs[2] in which they used an incompatible piece of technology despite Billet Labs reportedly having been clear about the specifications the product needs to work accurately (seen below).

Moreover, the prototype worth thousands of dollars was purportedly given to Linus on loan with the expectation of it being returned. However, Linus supposedly did not return the prototype to Billet Labs. Instead, he auctioned it off to the highest bidder, which could have been a direct competitor to Billet Labs.