it's a google ads video, but its not working. You can bypass it by activating adblockers, but you wont get bonus energy, x2 exp , etc.
Or you can also do this in chrome based browser ( chrome, brave, vivaldi, etc)
right click mouse on the black square, click inspect
right click mouse like shown in below picture, choose delete element.
Close the inspect by clicking the x button in the top right corner
The downside is you need to do this every time you login into the game, at least until they fixed it.