The 1000+ websites mentioned in the post are (supposedly) part of a "cold-calling investment scam using the name ‘Global Capital Wealth’". The Australian Securities and Investment Commission, the federal corporate regulator, has ordered that their IP addresses be blocked, which also catches innocent websites co-hosted at those IP addresses.
The Australian Federal Police also asks ISPs to block websites listed by Interpol as containing “'worst of the worst' child pornography", apparently via DNS (news reports mention "domains" and "URLs"), but perhaps also at the IP level. Most ISPs have complied; at least one has refused.
[My take: There may be a case for corporate regulation bureaucrats to get some websites blocked, but only at DNS level and only in smaller numbers. Blocking extreme child porn sites via DNS would be next to useless, so I hope they also block at IP level.]