Hardly 'scam artists' - people choose to go abroad for so many reasons, usually to have opportunities they wouldn't otherwise have.
Exactly scam artists. They provided false information to the consul, and/or violated the terms of their visas, either of which is criminal fraud. That why they want to put as much distance between them and Poland as possible.
Working 60 to 72 hours a week means that they are definitely not attending any classes. And no, no one at the university cares whether they attend or not. The university still has the fees and is not losing out. They are operating a borderline scam, too. All they care about is cash with no strings attached, free to spend how they wish without any interference from MEN. The state doesn't care, either. These "students" aren't going to stick around in Poland anyway. They'll abscond to the west soon enough and then be someone else's problem. No point in wasting any time over them.
And no, a visa to study in a Schengen country doesn't get people into the UK.
It doesn't have to. It'll get them as far as Calais, where they will discard their passports and hop a truck on the way to the UK. If they get caught, then they just try the next day. Or the next. If they don't possess documents, then it's hard for either the French or the UK authorities to deport them. India won't accept them without their travel documents, and won't be in any hurry to issue replacements. The UK Border Force usually won't detain them, but let them go free on their own recognizance so they can just disappear into the woodwork. And if they do get caught again, they can't be detained or deported without travel documents so they are released again. Lather. Rinse. Repeat. If they are not stopped before entering the UK, it's pretty darn difficult to get them out. Not like the US, where detention is the norm and the process is streamlined.
On a student visa, it is possible to work.
Not 60 to 72 hours a week, it's not. The limit is 20 hours a week.
And many in Krakow do exactly that. Even more in Warsaw.
No they don't. And I gave you the CBOS figures which prove that that is not the case. It's only a very rare few, and it's going to be fewer and fewer every year because of competition from the Ukrainians. Certainly a percentage far too low to justify moving to Poland to study with the hope of getting a job. Like I always say, make your plans on the very safe assumption that you will never be able to earn a single penny during your stay in Poland. That is far more probable than finding a job. So is ending up a victim of an employment scam.