There are many modern day bucket shops. Any CFD or "spread betting" product is just your broker taking the other side of your trade (and optionally, offsetting the risk). Prop firm "evaluations" or "accounts" are another popular one on social media.

Basically anything that amounts to a side-bet rather than a trade recorded on an exchange should (IMO) be avoided, and you're putting yourself in a situation where you and your broker have an adversarial relationship.