From a Finnish news site:
First, the man played at the Casino for a couple of days. During that time, he secretly took video footage of the spinning of the objects in the slot machine. After filming, the man sent the video files to another person using the Telegram application.
A FEW days later, the man returned to the Casino, playing on two slot machines for several hours a day for less than a week.
The court found it clear that the man’s 189-252 percent return winning percentages per day from the Gaming machines were not normal. No technical fault or other malfunction was found in the operation of the Gaming machines, which could have explained the exceptionally high return rate. – Niko Beach, February 21, 2023
Yes, the lucky gambler was given a conditional sentence — he must pay back the 33k euros.
A smarter operator might have appealed to all the things that Darwinians say have just happened randomly to escape conviction for manipulating the slot machines.