The Battlestate Games boss himself recorded a special voiceover for Escape from Tarkov. To get it, players had to open "loot boxes" from Twitch Drops rewards (it dropped with a certain chance from the "Rare 3" reward).
Now Nikita Buyanov has announced a large-scale promotion: a new round of Twitch Drops distribution has started, this time viewers will be able to get this voice acting with a 100% chance.
Information about the promotional campaign can be found in the corresponding section on Twitch. To collect all the rewards, you need to watch Escape from Tarkov streams for 9 hours. Examples of voice acting can be listened to at the following link.