I had maybe 4 or 5 copyright strikes on one of my adult accounts all time. No ban.
I don't know about how much you need to get to be banned. And I believe there is no set amount like on Youtube, and the system is vague on purpose. So that twitter can delete accounts it doesn't like for political or other reasons, and keep others.
I know accounts like yours who are constantly get striked and never banned, and others that are banned for copyright reason. My speculation is that twitter doesn't take very seriously bot generated mass copyright strikes by copyright guarding companies. But it takes more seriously, copyright strikes by individual performers. Because the latter will generate a lot of fuss if you tweet their stuff without credit. Hence I personally never use videos by individual performers (from onlyfans, chaturbate, etc), but only vids from big studios.