Funding of terrorism is still happening now, and their support is being funnelled through countries that are not under any economic restrictions, some even have good relations with US, like KSA. For example, most official fundamental/terroristic TV channels/groups are based there. Most shell companies used by oppressing regimes in MidEast are in the UAE.
"doing this to entity X stop that from entity X" "no, look, here is another entity Y where didn't do this, and it still does that"
If anything your comment implies we should sanction all of these countries too.
- Sanctions don't achieve the goal of stopping funding terrorism as evident by it still happening.
- IF the point of sanctions was to _actually_ stop terrorism funding, you'd start at the origin of where these ideas start, which is known to be Wahhabism/Salafism.
- At least, you'd start at the origin of how people holding these ideas were supported and given weapons and training to achieve regime change goals and to fight against Russians in Afghanistan.