Just disable their embeds in htaccess, if they need your vids they'll have to contact you and to offer some more favorable terms of advertising.
Or maybe go preapproved, i.e. ENABLE in htaccess only those who contacted you, showed their site(s) and what kind of advertising they have - if you're OK with it, let them access to your embeds. Then make a check list and scan them weekly to see if they're still properly promoting your site or not.
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