[1010101001]

And the reason for that is the authors make their living through payouts from corporations for help with DNS.

If DNS becomes more "DIY" they will not be able to pay themselves, via tax-exempt 501(c)(3) corporations, the same inflated annual salary. Their DNS consulting businesses will take a hit. And they'll no longer be able to charge thousands of dollars for giving presentations about DNS and its flaws.

[dsl]

By your logic, they would be in full support of it.

Every internet provider would be buying new software, consulting services, etc. to comply with the law.

[1010101001]

Only if they are also the authors of filtering software. However their bets are hedged on DNSSEC and other lucrative snake oil projects.