If you are interested there are essentially 3 problems:

• the GPU fiasco: Where they didn't just bork a install. A small 2 man startup send them their (I think only or at least best) prototype for testing and even included the correct GPU to use it with in their packet. LTT for some reason tested it on a different one (obviously not working well there) and came to the devastating conclusion that NOBODY should ever buy this. Then instead of as requested sending it back they auctioned this prototype off at an event they hosted.

• the second problem that was also called out in the video published by gamers Nexus was a consistent pattern of publishing data errors in their reviews. And if such errors are caught, they would be inadequately handled. Maybe through a post under the video or by later replacing part of the video. If they caught an error before publishing they also often would just add a small onscreen text correction with an * instead of redoing that part. All problematic as many people will miss those corrections and thus be influenced by wrong data.

Those two points are especially problematic given the reach of LTT, since they are by far the largest tech YouTube channel. And thus influence a lot of people, especially beginners. Their initial response to these problems was also extremely bad.

• the third problem was a former employee coming forward with allegations of them being an extremely toxic place to work at. With sexual harassment, intense workload and so on.