I had literally never heard of this company before now and all the threads on Reddit have thousands upon thousands of posts. Why is this such a BFD? Not saying it isn't, I just live under a rock.
LTT is one of the biggest YouTube channels and commands a lot of influence in the PC gaming community. The parent organisation actually has a lot of channels on youtube and they pump out a ton of videos under a few different names so even if you don't recognise the LTT name you might have seen some of their other videos just in passing.
Why is it a big deal? Because the accusations are big, given their influence on peoples' purchasing decisions.
LTT, for better or worse, is a very popular tech/PC gaming entertainment YouTube channel. A lot of the younger folks in the nerd space probably grew up watching his content.
I started watching a little late, because I thought he seemed kind of annoying back in the day, but I actually do enjoy their content. It's clear they have some organization and communication problems internally that they need to sort out, though.