I guess a shady illegal mining with free power (like it seems they did in Ukraine) is needed for PS4 mining to turn profit
At some point they had to do a calculation that it was more profitable to mine with them than sell them or purchase different equipment.
Let's say they got all these PS4's in used in some wholesale auction they probably still had to pay $150 each. That's over $500k USD. Do they mine better than a 1050 ti or AMD equivalent? So do they mine more than a 1060 6gb? Those were around up till say January for reasonable costs.
It looked clean and well set up so I would imagine it was running for a little while.