That’s an extreme accusation

Yes, and I can make it without fear of him suing me, because it's true.

It was pretty obvious if you have more than 2 brain cells and the ability of critical thinking.
But Gamers Nexus actually gave examples of obvious "conflicts of interests":
https://youtu.be/FGW3TPytTjc?t=1575

This is actually from way after I stopped viewing LTT trash, but I can't just go back multiple years and dig up the evidence.
But if you really are curious, you would have to track his "sponsors" and compare them to his "reviews". And the evidence will quickly be pretty clear.

For instance it was very obvious that after AMD became a major sponsor around 2018, Radeon suddenly got way better reviews.
Raja had tried to suck up to him, and give him special treatment and privileges of first access with the Vega release, which didn't work the slightest. But when they became a sponsor THAT WORKED!

And when Intel stopped their sponsoring of him, he suddenly made several features complaining about how bad Intel was. This was at least true, it's just funny how the criticism didn't come out until they stopped paying him.
Intel stopped supporting YouTube reviewers in general, but other channels did not suddenly switch how they reviewed Intel.

LTT is corrupt as hell, to the point he may use his popularity for extortion. He probably doesn't think so himself, because he seemingly doesn't have the intelligence to see that what he is doing is wrong, unless it is pointed out to him very clearly.

But if you don't have eyes to see what's going on, I really can't help you.