It is true.
Overall, for those who are interested,
In order to scrape youtube for videos/channels you will have to develop software that will be fast enough to process millions of requests, in case you want to achieve something meaningful. So forget about browser automation. We are talking about raw HTTP requests here. Which is also constantly changing so you will have to adjust it from time to time. You will need to pay for quality proxies and computing resources (such as VPS).
At that point, when you will have all the above, you will still have nothing because youtube tends to give a lot of trash, so-called "recommended" content. For example, you will be searching for "dogs" and youtube will give you some crypto-related content. So you will need to build additional scripts to verify the youtube search results to be relevant.
Even after that, you will still have little because if you want business emails you will have to build a system that will not only solve recaptcha2 (which is very costly if you outsource it) but also deal with google sign-in. Since youtube does not allow you to scrape business emails in case you don't sign in. And guess what? Youtube is not giving you more than ~50 business emails per day per account. By the way, prepare for bans.
However, some people still think it's a piece of cake type of task.