Incentivised traffic arises when an affiliate offers a player something of their own for signing up or depositing: money, a gift, points or part of their commission. The player then comes for the reward, not for the game.
What the rules say
Programmes mostly forbid such traffic outright, especially under CPA. The usual consequence is withheld commission for those players, and sometimes a closed account.
Why it is also a legal question
Gambling advertising must not mislead or present gambling as a way to earn money. If you offer your own reward for a deposit, check, besides the programme’s rules, that the message does not promise earnings and does not mislead.