There was some discussion to this effect last year: http://mail-index.netbsd.org/netbsd-users/2018/05/30/msg020857.html
But did not see it mentioned on the changes page: https://www.netbsd.org/changes/changes-9.0.html I think FreeBSD has got it already: https://www.cryptomonkeys.com/2018/05/freebsd-blacklistd/ Mayuresh
