you could always use mellow ads like i do and filter out the "investment" ad category which hyip/ico/cloudmining all come under.
i still make a reasonable amount each day and i bet you would make much more given the large traffic to freebitco.in

you get left with ads for things like gambling/casino sites (but you filter that out too if you want to!), other faucets, etc
We had Mellowads before but if you filter those out then the others don't want to advertise on a faucet. We removed advertising for a reason and nothing has changed since then.
no worries, i respect your decision.
however im surprised that you say no-one wants to advertise directly on a faucet - the other big faucets that use mellow ads seem to get plenty of direct advertising.
and of course even without that then you will still earn from their backup network ads
anyway, dont know why im even suggesting this - if you use mellow ads then you will take a massive % of the daily pool which means myself and other smaller publishers would suffer!!