First and foremost, I'm sorry for any upset we caused by using OCCT without paying for a professional license. I've gone ahead and picked up a pro license to cover our use. https://imgur.com/HlDn2Ic
The truth is I had no idea OCCT was a paid software. There is a donation prompt in the application, but otherwise no indication that I should have been using a paid version.
Ignorance doesn't excuse our sloppy approach to software licensing here, though. The simple fact is we pirated your software (which as some of you realize I never said we were perfect about, and in fact have pointed out times when my own ethics aren't bothered by it, but whatever) but hopefully our purchase of a paid license will allow us to put this behind us.
There are some other aspects of your post that I could probably type out a longer reply to - like the insinuation that (even if we wanted to) LTT could somehow destroy your OCCT business, or that we don't reply to outreach (I searched our public email and we only have two emails containing the characters OCCT, and neither of them are from you), and the fact that honestly I've got a little bit of whiplash right now from how abruptly this went from "thanks for the shout-out" to "I'm upset enough to write a novel on reddit about it".
Most devs recognize that our use of their software is closer to educational use than it is to commercial use and don't mind us using their software for free if we are demonstrating how to use it and showcasing it to potential customers on the channel. Based on this Twitter post, I assumed you felt the same way. I guess you don't.
But assumptions lead to disasters, and we absolutely should have reached out. Hopefully you can understand how the error occurred and we can put this behind us.