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If that is case then I think URL Shortener are best for earning site promotions. I found many faucet owners are using Shortener to promote their sites. And if you say no to URL Shortener then saying yes to faucet doesn't make much difference.
So the reason why he said to bring conversions to the clients, not just clicks is because shortener can be used to just spam everywhere including the messaging app. Visitors sometimes doesn't have any idea where the link goes and when they did click, they quickly get out too after learning the contents and this is because its not a targetting traffic.
CPM adnetwork is what you looking for. I hope there is in crypto.