Assume a two-way game with no draw for simplicity's sake.

-  Cloudbet: Team A @ 3
- NitrogenSports: Team B @ 3

Let's imagine you had $100 to invest.

Consider these two possible outcomes if you placed $50 on each event.

Outcome 1: $50*3 = $150

Outcome 2: $50*3 = $150

Either way you're making a risk free profit.

Let me know if you have questions.

Best regards