You pick the bar. Anyone who insists on theirs is usually on commission

Documented bills at commission bars run 4,000,000+ VND (~$160) — for drinks you never ordered, at "bottle" prices, with a bouncer between you and the door. Two costumes, one con: Tinder or Bumble matches worked by paid "booking girls" who will only meet at one specific bar, and women on and around Bùi Viện in HCMC who befriend solo travelers and steer them to side-street venues. The Tinder variant is documented in both HCMC and Hanoi's Old Quarter. Travelers also report drink-spiking risk at the same venues, and UK government travel advice for Vietnam warns to buy your own drinks and keep them in sight to avoid spiking — treat it as a reported risk.