Welcome to the largest gaming community on Lemmy! Discussion for all kinds of games. Video games, tabletop games, card games etc.
Submissions have to be related to games
No bigotry or harassment, be civil
No excessive self-promotion
Stay on-topic; no memes, funny videos, giveaways, reposts, or low-effort posts
Mark Spoilers and NSFW
No linking to piracy
More information about the community rules can be found here and here.
The first step is to be kind about it. Send a message over YouTube explaining that you are the developer and kindly ask them to take it down. It is important to be very polite and non aggressive about it.
You can also report the video stating it is advertising illegal activity.
As others have posted, this guy has no subs, and not every view/sub equates to a purchase or instance of pirating. You may lose a few potential sales, but you need to understand this is not lost revenue as there was no guarantee they were going to buy it in the first place, and you have not lost something of limited stock.