The answer is obvious to your fixed question is it not ?
The answer depends on your subscribed system of ethics. If you subscribe to the Aristotolean Virtue Ethics system, the answer is mutable which undermines the ethical framework.
Virtue Ethics is the subject, and it is Aristotle's virtue Ethics. The restaurant will see an increase in customers, if the content creator doesn't get poisoned. But if they carry on serving food gone bad, it will backfire. In truth virtue ethics doesn't even come into question while the restaurant resorts to an action of their own demise.
That's explained in the following paragraphics.
In the case of a restaurant serving contaminated food, having a food content creator of any kind would 100% backfire. A simple thumbnail stating how the vlogger got sick will be among the highest of view on the channel.
No surprise. Common sense. Very simple.
What if the food vlogger posts a persuasive good review coercively to negate the low ratings for personal incentive?
Then that will fall out of bounds in terms of virtue ethics, as the golden mean is also comprised of deficiency. Deficiency in this case, as the vlogger's own reputation and livelihood will take damage when the masses notice the place had bad reviews to begin with. Also, he wouldn't be eating the restaurants food on camera.
The term, Play stupid games win stupid prizes, is a real thing.
You probably don't think the concept of the vlogger faking a review over some personal incentive while knowing the food is shit, is a good thing either, and if so, there's a reason for that.
If someone lacks common sense, their life will be filled with countless calamities. It's not a social construct, but a real thing. Even in the stone age, things like "indiscretion" which would be the opposite of common sense will fuck you up.
Before there were written laws, our great ancestors had unwritten rules for their survival. They simply couldn't keep one who'd get the rest of them killed.
Most cultures, have roughly the same values, and if someone doesn't mesh well with another culture, common sense can guide one to decency. I think even in the past, long before the radio, another race would recognize a foreigner and know their customs aren't the same. Common sense again.
It is often said that laughter is universal, but so is crime. The pagans thought it was justified to put heads on pikes and burn people in structures
Various other cultures did that too back in the day. It did serve a purpose, and perhaps it was very effective.
Today stuff like that is a bit of an eyesore and not something people wish to see.