Fast payouts, slow decisions
Instant withdrawals cut both ways: the easier it is to cash out, the easier it is to redeposit and keep going. Decide your limit before you start and let that decision, not the next bet, be the fast one.
Only stake what you can afford to lose. The warning signs are the same whatever coin you use: chasing losses, betting more than planned, borrowing to bet, or gambling eating into your sleep, work or relationships.
If the fun has gone out of it, get support. In the Netherlands: Loket Kansspel (loketkansspel.nl). Internationally: GamCare (gamcare.org.uk) and Gambling Therapy (gamblingtherapy.org). You must be 18 or older to gamble.