The biggest problem with such a clause is that it is hard to define “evil”, even if it seems clear to you. Some people think that abortion is evil, so are abortion clinics banned from Json? What about the military and weapon manufacturers? Killing is evil, but you all know how the discourse about the military as national heroes that can’t be evil in the US goes. What about a service like X - is it evil? Can you define “evil” for a surveillance tool that brands itself as ad tech?
Don’t worry about YouTube - according to alphabets filings they account for ~10% of Googles ad revenue. Google is posting record profits every quarter, so they should manage.