Shatner did ask for Nimoys consent to be part of The Captains and Nimoy said no. So Shatner sent someone to a convention to record him and ask questions. Nimoy found out and was enraged and never spoke with him again in the last 5 years of Nimoys life. Shatner revealed it himself in his 2016 book about his relationship with Nimoy. In it he still down plays it by said "it was so small".
I fucking hate that man. It's why I am so insanely glad that I've gotten to spend a little time with a couple of my Trek heroes who are incredible people. Having Anthony Rapp on my PlayStation friend list? Glorious. I've messaged him so many times asking stupid DSC questions.
I have not, we're both more into single player games. The dude is a beast though. 100%s or platinums every game he gets into. His trophy cabinet is just 100% and 2%. It's insane.
I was thoroughly surprised when I found out but it makes sense. If you're always working, a good video game can really fill some of the time and help take you away. I just assumed Anthony was more of a theater geek (probably because of Rent) than a nerd and leaned more towards physical things to do.