Typically they have already done so, in the licences with their
software; for example:
Inform: "may be distributed provided no profit is involved."
WorldClass: "Unlimited NONPROFIT distribution of WorldClass is
permitted"
Christminster: "You may not [...] distribute copies for a fee
exceeding the cost of distribution."
Lethe Flow Phoenix: "no fees may be charged beyond those necessary to
cover the costs of distribution or archival."
The Legend Lives: "Electronic redistribution is permitted, but only if
not for profit."
Curses: "may be freely distributed and used provided no profit is
involved"
Theatre: "no costs may be charged for except for the distribution
costs"
and so on. It seems clear that anyone attempting a commercial
distribution of this stuff needs to negotiate a licence with each
author.
-- Gareth Rees