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To be fair, it's at the end of the presentation, not pushed via a popup modal 12 seconds after page load.

yes, i'm 100% okay with this

I think it's fair game to try to build a product and tell people about it in a healthy way. The person has made some content that you found enjoyable enough to consume until the end. Giving you a prompt on how you can find more doesn't seem dark at all to me. If you aren't interested, no big deal -- you just close the tab like you would have anyway.

I don't see it being at the end a dark pattern. It's not withholding anything in exchange for contact information.

It's only bad when other people are doing it to you. When I do it, it's fine.