These money makers are mainly for people just getting into the game that need some starter cash or those that are rebuilding from nothing - if you want to make even better money that requires some higher levels & more mechanical skill check out my money making playlist: ru-vid.com/group/PLCeQU-BLzBlcqyqR1EbNO5NhPNDY5cSvK
One I don't think was mentioned, is picking up items in the catacombs from people doing barraging tasks be it nechs or dust devils. Lots of players don't bother picking up all the items, and some won't even bother picking up the rune items to alch. Idk the gp/hr doing this but I would guess it's probably somewhere around 500-800k/hr depending on your luck and there's no requirements.
This is why it is never worth it to farm gp for bonds in f2p. Even the lowest tier money making method available for members is several time better than whatever you can do in f2p.