Image search is quickly done, We have tools like Google image search. Not 100% of course, but will detect quite a lot.

Openmic will help.

For the curators on this platform, anything that requires more than a couple of minutes work, will not be done, I actually have to let a lot of track postings go unresearched and not voted because it takes too much time to figure out if everything is solid. Can you imagine, already today we have 100+ maybe even 200+ new tracks posted and shared, and when I need to check all these, it takes me a day to do so. Plus, I have no instant view on what I already checked in Steemit, so next time I have to redo it again. Of ourse some users I remember, but many I dont since I see so many. The whole UI is not build to handle all of this in a good way, while also DTube and DSound dont even have a TOS stating that illegal uploads are not allowed. They also dont do any ID check. Since ID checks could be done by some independent verification company keeping your identity secret, but do a check based on eg you ID card, driving license. A common method by car rental companies and even the crypto exchanges when you want to transfer larger amount of funds to some other wallet, or to fiat.