No they are not. Most big European banks are technically bankrupt. Most big American banks are technically bankrupt too. The only reason people in general do not know about this is because they used a lot of financial tricks to make it look like they are healthy.
In fact, Deutsche Bank very likely had to announce that they are bankrupt this very month due to the fact they never learned from the former crisis -- causing a shockwave throughout the entire financial market worldwide, if not for COVID. Now they can just blame COVID when the entire financial system tanks.
Here's a video explaining what has been going on in Europe all these years. It will not be different for the United States (or certain parts of Asia for that matter) -> https://www.youtube.com/watch?v=Cu6Em4a4pG4