We have implemented a daily updated blocklist of known IPs of organizations/companies/individuals that collect information or provide bad data. This list is by no means a perfect solution but just adds another additional layer of protection.
In the past two days, these blocklists caused some unforseen consequences resulting in some proxy errors but this has now been rectified and everything should be working as usual. We apologize for the inconvenience and thank those who brought this matter to our attention.
This morning we did a final round of reboots to implement this on all our servers and as such there were brief disruptions.