What you forget is that you need a lot of capital to start a bank. In most European countries, the capital required is about 10 million euros - in addition, there are huge demands for buildings, staff, training, regulations, etc. - the fact that you can pay for a license that may only cost (guess) 50,000 EUR is not enough - it is far from the goal.
But okay, none of us here know if you actually have maybe 30 or 40 million euros. It has been seen before, they have also been found on this forum before, as unlikely as some would say but︀ true.