The line comes from Resident Evil 4, Capcom's survival horror game first released in 2005, where a mysterious hooded merchant sells weapons and upgrades from shops scattered through the campaign. After each transaction he offers a polite thank you, and players quickly adopted the voice line as a shorthand for a completed deal. Clips of the merchant circulated in gameplay videos and edits, and the short thank you survived as a reaction sound because it is instantly recognisable to fans and fits any moment of gratitude or successful bargaining.