Philanthropy? Charity? Those words fit perfectly.
Does anyone sincerely set out to be ineffective in those endeavors? I can't imagine anyone who was knowingly insincere would have trouble also claiming the moniker of effective altruism. Nonetheless, I think the term "effective altruism" is also intended to encompass and imply some additional--if optional--characteristics about the giver or the form of giving, such as leading a more sustainable lifestyle or the consideration given to one's choices in choosing particular acts of charity. But we don't need that term merely for the act of distributing or funding the distribution of mosquito nets--philanthropy and charity are more than sufficient. And, technically speaking, charity has usually sufficed in any event--e.g. clergy who give their entire lives over to charity work weren't in search of more descriptive nomenclature, AFAIK.