I'd be happy to provide more info but I have none.
First I communicated with support which told me that my account was restricted most likely due to 2.8 clause violation (non html content) and suggested to contact with sales which I immediately did.
Sales over the phone (was fastest) told me that it's good I contacted as otherwise in 24hours my account would be fully banned(whatever it means) and that they will prepare me an offer in 15 minutes, but it was taking longer (no response after an hour or so) and in the meanwhile I wrote Twitter and HN post which CTO of Cloudflare noticed and then after a while I've got another phone call from sales that I should update my ticket to ask unbanning my account as it was approved now by CTO which I did and that solved the issue at least for now - and that's it - no further info what the issue was, still waiting on Enterprise plan quote for me.
Sales over the phone (was fastest) told me that it's good I contacted as otherwise in 24hours my account would be fully banned(whatever it means) and that they will prepare me an offer in 15 minutes, but it was taking longer (no response after an hour or so) and in the meanwhile I wrote Twitter and HN post which CTO of Cloudflare noticed and then after a while I've got another phone call from sales that I should update my ticket to ask unbanning my account as it was approved now by CTO which I did and that solved the issue at least for now - and that's it - no further info what the issue was, still waiting on Enterprise plan quote for me.