Arnt Gulbrandsen writes:
the IETF AD or a designated expert can add a comment such as "don't
implemenent"...
So the AD can say such a thing without community consensus?
If ISOC, IAB, IESG, IANA, et al. allow their names to be attached to
such statements, they will be held liable under United States antitrust
law for anticompetitive effects of those statements. See
http://caselaw.findlaw.com/cgi-bin/getcase.pl?court=US&vol=456&invol=556
for a Supreme Court decision imposing liability upon an engineering
standards organization for giving subcommittee chairs authority to make
such statements. The organization ended up paying $4.75 million.
---D. J. Bernstein, Associate Professor, Department of Mathematics,
Statistics, and Computer Science, University of Illinois at Chicago