Paywalls are done in many ways:
- Youtube membership BS. Youtuber sets certain videos only for members, so when you like their content but you see most of their videos are actually only for members only it can be a turn off. These videos are like this:
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I'm no expert of Youtube for I really don't use Youtube much outside of my uploads, some meme videos and what buddies and friends send me, but I pretty sure member-only videos are probably doesn't show up when you search, they are only visible on the homepage of channels.
- However classic paywall is "yo if you wanna watch the rest of the video here is my website, pay me money to unlock membership and watch my content".
- Since having a website may be bothersome people use Patreon anymore. On their free videos they mention this amazing paid video lol. A method is making streams free on Youtube, Twitch, Discord, et cetera but uploading these videos as paid content later on.
As for ad, as I said an ad can be literally part of the video that the Youtuber talks about the product they advertize and Youtuber themself make the ad video part of their video. Nothing can prevent it lol.
This membership only videos and the videos that have such "part of the video ad" may be country specific too, which I mean in whatever country you are from the Youtubers may don't have such videos but especially around the world these shit got so popular some once free videos I saved turned into membership only ones lol.