It doesn't enable cheaters, that's nothing to do with homebrew or CFW on the PS3. Hence why there are still cheaters on PSN and they have been on there from long before the jailbreak.
If a CFW that allows retail PSN access was released Sony would be very quick to patch it, since there is absolutely no way a modified PS3 can get on PSN and be undetectable. All the security is server side and can be updated independent of firmware updates.
Windstyle you need to read Barry's post above. It says it all really.
There is no way you can go on any network without it showing up, regardless how you mod the thing, once a unit is modded, it will show up, if you reset it back to stock it will still show up as modded. If I have time later I will do a video of the scans and tests I do on my modded and stock ps3's , and show the changes and differences there are.
Unless some bright spark, can find a way to turn the modded flag off, then regardless of firmware it will always stand out as non standard, then reject the unit from PSN.