Do you know how they recreated his style? I couldn’t find such information or frankly have enough understanding to know how.

But if they either use his works directly or works created by another GAI with his name/style in the prompt, my personal feeling is that would still be unethical, especially if they charge money to generate his style of art without compensating him.

Plus, I find that the opt-out mentality really creepy and disrespectful

“If he contacts me asking for removal, I'll remove this.” Lykon said. “At the moment I believe that having an accurate immortal depiction of his style is in everyone's best interest.”