We also had a lot of banned cases in 2020 and early 2021, but I noticed that the actions on plagiarism cases became so minimal after the recent two unbanned cases we had earlier this year, and the forum activity has also decreased since the beginning of last year. I personally believe that onetime plagiarism for users who have contributed to the forum for many years getting banned is just too harsh; perhaps such users should be given a temban as a warning for first plagiarism, and maybe pamban after 3 attempts.
I would give them the permaban after a second time. I mean you plagiarize, they catch you they warn you or give you a tamporari ban and you go and plagiarize a second time? For me waiting for a third would be too lenient. The second time you can no longer say that you did not know that plagiarizing was forbidden, or something like that.