Good to hear that you are not experiencing problem in coins.game but you should also remember that there are unresolved complaints/accusation against this site. Their rating in casinoguru is also so low (3.3/10).
That case was many months ago and after that, Coins.Game stopped their advertisement, signature campaign in the forum and their representative also abandoned the forum too.
Also the fact that their official representative is no longer active here is another thing to consider.
Some casino did not have active representatives on the forum but they still run signature campaigns through managers. It's different than casinos without any activity in the forum, if the representative left, it's not good signal. Together with their unresolved case, it's can be considered as not a good flag.
Although you say that they are the most rewarding casino due to their free spins offer you received every week but always be careful. You can take the advantage from the free spins, but looking at the other red flags, it is better to stay away.
It can be honey pot and they can do it with incentives behind and with unresolved case, it's not good at all.