I hope the shared internet is not the case. I live in an apartment building of 3 apartments and internet is included in the rent.Suspecting someone of syndicate play does not warrant confiscation of winnings. Proof it it does.
Suspicions, justified or not, can warrant an account closure however. The casino is free to choose whose business to accept.
If the OP lives with roommates, in some kind or shared domicile, or even an apartment block that might include internet, or even a previous tenant who may have played there previously, it might be enough to raise red flags.
There are other casinos out there, not all of whom operate as ethically as Trada.
If your signup comes from a known bonus-hunting site, that can be a red-flag for suspected advantage play also. This would not justify confiscation of winnings, but might mean the casino may not want you as a customer.
Be aware Neteller and some other ewallets may share info with casinos about personal transfers. Your own bank will not do that, or credit card providers.