Most of the online casinos are just scared of high rollers. On the one hand they can bring a lot of profit for the casino, but on the other hand, even a small win like 200x with 400 Euro bet (80 000 Euro win) can end up with a withdraw problem for an online casino, especially for new one.
Playing slots for free in a demo mode is a good way to know everything about online slots without losing real money. Find out the best way to do it.
If you are living in Iceland, you are already lucky as ONLINE gambling is still legal there and some of the best online casinos available for Iceland players.