All, if anyone is interested in the classic episodes without ads, I believe that the official MST3K/Gizmoplex channel on Roku/AndroidTV/Apple TV etc and gizmoplex.com website are still ad-free for the classic episodes. You have to register, but it's free. Note, I used the Roku app (I do not use any ad-blocking software/infra) and did not encounter ads, but have no experience with the website or other app platforms.

https://mst3k.com/gizmoplex-visit/