The new policy, which includes a ban on campaigns in defense of “claims of discriminatory acts,” would appear to make it more difficult to raise money on behalf of businesses facing crippling civil damages awards after refusing to provide services for gay weddings for religious reasons.

Travis Weber, a lawyer and director of the Center for Religious Liberty at the Family Research Council, said GoFundMe’s revised policy “could exclude and discriminate against all types of fundraising.”

“Who will determine what a ‘discriminatory act’ is? Will the term be decided according to legal standards? If so, which standards?” Mr. Weber said. “Or will it be subject to the same arbitrary decision-making we’ve seen from GoFundMe so far?”

The previous policy barred “Campaigns in defense of formal charges of heinous crimes, including violent, hateful, or sexual acts.” The new policy bans “Campaigns in defense of formal charges or claims of heinous crimes, violent, hateful, sexual or discriminatory acts.”