I don't think the scraping is the full reason. I was not on lemmy/kbin or any other part of the fediverse and I still got this random permaban, in fact it happened before the pricing changes were announced on May 31st.
Also, my username there is different to what I'm using on the fediverse.
Prior to being permabanned I also never used the API for anything. Only used it for the scripts to wipe my account clean (so being permabanned doesn't typically prevent one from creating the API tokens or actually using the API, it seems).