Gibraltar has signed many TIEA - Tax Information Exchange agreement with many European countries. They provide information to tax authorities upon request & they bill the other country for it.
In Europe, the best for sure, to be a fiscal resident live in a country with a Flat rate for incoming tax like Czech republic, Hungary or Bulgaria. For instance, in Czech Republic you pay 15% on dividends from a foreign country whatever the country where the dividends come from.
Transferring money from anywhere to anywhere in Europe without paying income tax is not impossible but i was referring to paying 0% corporate tax and living in another country of Europe where you would pay income tax.
I think you were right to leave Gibraltar. In fact, Gibraltar should leave EU because there are a Gibraltar territory. However, Gibraltar government and companies benefit from being part of the EU without getting the disadvantage of the EU (it is out of EU Vat zone and people invest because there is less taxes). If they want to be part of the EU just like Malta, they will have to raise more taxes.
For instance, incorporating the online business in Gibraltar and living in Spain.