The CEO seemed really self absorbed and saw himself as an innovator with letsencrypt stealing business processes from him (which makes filing for trademark infringement make less sense). He took it as a personal insult, and did not even appear to understand that letsencrypt was a public service rather than a for-profit product.
There was a fan who claimed to be a paralegal cheering on the CEO's rant yet appeared to confuse trademarks with patents with copyrights.
At least with the forums alone, that thread read like teenage high school soap opera, not a business. It was like an echo chamber of the CEO's fixation.
And now this. Sounds like there was a deliberate business decision to use faulty tech, and forgetting the wider social impact of operating a CA.