Not entirely true - bad things can be measured. Harm exists and has a value. The value, in this case if you wanted to derive, would be the amount of money consumers spent on random advertised things.
Sure it would be hard to measure - but you could argue that money is money consumers lost as a result of Mr Beast (or maybe YouTube as a whole).
For example, looking to the tobacco industry: they were incredibly economically successful because they leveraged the weaknesses of the human brain to sell their product, namely nicotine addiction. This is now largely considered immoral, but let's look past that.
We can still measure the badness, or harm, of the tobacco industry objectively. We see how much money was/is spent on cancer treatment, COPD treatment, etc. These analysis have been done before and it's pretty damning, billions of dollars. In some cases, the cost of tobacco straight up exceeds the profit. Meaning, from a communal economic standpoint, they are a net-negative. Yes, it's true, tobacco, while wildly popular, is economically in the red.
Of course, we live in a staunchly capitalistic, individualistic society. Communal economic cost/benefit is almost never looked at. Which is why we had the problems with the tobacco industry, and why the obesity epidemic grows. Mr Beast videos are not of this scale, but I would argue they are of this nature.
No it can't, economic success is completely linked with morality when your success is linked to producing tons of CO2, which is going to put our planet, and in particular poorer people, in the shitters
that is your moral view or value. It is not a universal value.
Economic success is indeed a thing, and it can be discussed separately from moralityl.