It should be safe.
Operator is Digimedia Ltd, and the affy program is Fortune Affiliates.
The Digimedia website only lists three casinos, none of which are Euro Palace. It is also missing other known casinos.
Digimedia seems to be the company that owns Fortune Lounge itself, which recently mothballed 4 of the 8 casinos in it's portfolio.
Euro Palace seems to focus on Europe and particularly the UK, whereas Fortune Lounge is "rest of world", and was previously focussed on the US.
There is an easy test to check whether Euro Palace itself is a Fortune Lounge casino, rather than simply another "independent" casino owned by Digimedia.
This is based on the advent calendar promo. It only works in ONE account across the whole Fortune Lounge group, thus the test is to first claim the day's promo at, say, Royal Vegas, then at, say, Platinum play (where it will be rejected with an error message).
Next, try claiming what appears to be a different promo at Euro Palace, that "purely by coincidence" is also an advent calendar with daily prizes.
Results and conclusion.
1) It works - casino just happens to be owned by same holding company as Fortune Lounge brands
2) Fails with same error message as Platinum Play test - Euro Palace IS directly a Fortune Lounge casino, but one "in disguise", and not mentioned anywhere "on record" as far as players can see in terms and conditions, etc.