suggest it to people.
Oh, and tax fraud. I don't remember who it was, but some middling YouTuber awhile back was taking vacations, posting a video or two, then writing them off. I don't know if they got caught, but it's typically a bad idea to confess to a crime in the form of a "how to get free vacations" video. They were flooded with "delete this" comments, and eventually deleted it.
The other thing about the YouTube ecosystem is that pretty much all product reviews are paid, whether the person discloses it or not. You may run across the occasional organic video where someone genuinely liked a thing they bought and made a video of it, but if it's a popular channel, the reviewer is being paid.

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But then when you start watching them it’s just some random couple’s video diary of their vacation. This isn’t the top 7 things to do in Tuscany. It’s the 7 things that you did in Tuscany. There’s a difference.
I also can’t imagine spending a bunch of my time at an amazing vacation spot staging and filming reaction videos and narratives. Seems like a great way to make your vacation utterly miserable. But 17 randos on the internet will like it, which is certainly more important than actually existing in the moment and enjoying your experience without trying to document it to get external validation.