Literally nothing that you wrote surprises me :P Sounds absolutely on par for Polish approach to these kinds of "problems".
The main key point here is that you arrived by train - and indeed, trains are not really checked at all. But if you came by plane, you'd absolutely be entered into the system and you'd have police coming over every other day to see if you're actually there. You were just lucky because of your mode of transport. I've heard similar stories from people crossing the border by car - also no hassle at all.
And to add to that - if you were actually diagnosed with Covid, your name would also be entered into the system and police would be checking if you are at home. I know my entire family were checked every day when they got ill.
I didn't mention Poland as some sort of great foolproof implementation - just that if you are actually "in the system", police checks if you are doing the quarantine or not. In the UK we were very much "in the system" and literally no one cared - we didn't even get a phone call to ask if we're actually at home. Literally nothing. Again, I'm not surprised you escaped the whole thing if you arrived by train.
The main key point here is that you arrived by train - and indeed, trains are not really checked at all. But if you came by plane, you'd absolutely be entered into the system and you'd have police coming over every other day to see if you're actually there. You were just lucky because of your mode of transport. I've heard similar stories from people crossing the border by car - also no hassle at all.
And to add to that - if you were actually diagnosed with Covid, your name would also be entered into the system and police would be checking if you are at home. I know my entire family were checked every day when they got ill.
I didn't mention Poland as some sort of great foolproof implementation - just that if you are actually "in the system", police checks if you are doing the quarantine or not. In the UK we were very much "in the system" and literally no one cared - we didn't even get a phone call to ask if we're actually at home. Literally nothing. Again, I'm not surprised you escaped the whole thing if you arrived by train.