Of course, complaints have been sent to the abuse addresses of the repective ISPs after each incident but most ISP don't do anything about illegal behavior of their customers. The majority simply sends an automatic reply about an opened ticket but never replies, while the attacks continue. That even (especially?) includes larges providers such as Hetzner and even companies which are involved in government or defense contracts, such as L3.
I also started to compile a blacklist of repeated attacking IPs and networks which can be found here.
(click for whois)
Last update: 2019-11-22 00:00