First comment on that post claims that according to Mimecast, 37% of EU-based spam originates from Hetzner and Digital Ocean. People have been asking for 3 days for a link to the source (I can't find it either).

On the other hand, someone linked a report from last year[0]:

> 72% of BEC attacks in Q2 2024 used free webmail domains; within those, 72.4% used Gmail. Roughly ~52% of all BEC messages were sent from Gmail accounts that quarter.

[0] https://docs.apwg.org/reports/apwg_trends_report_q2_2024.pdf