Is it normal for them to ask for my coin address?
I've read about all the scams going on. About how good hackers are.
And why do they need my coin address?
IMO, that's normal of course to see the 7 addresses that you have and which one the right you chose and use.
It might they will check the right one and suggest which one you're good to use but why there are 7 addresses of this coin?
Are they using different blockchain networks? If so, that's the purpose they asked for.
If you don't trust this wallet, there's no reason you keep using them.
Remember always that awareness is key to protecting yourself from potential risks that might you'll face in the future.
IMO, they are acting like isn't a noncustodial wallet it seems a centralized one.