After redoubling, ensuring the opponents can't play undoubled below 2N, and making a penalty double of 1♠.. both GIBs are happy to pass out 2♠ undoubled.
This isn't just an advanced robot issue. With basic robots, North doesn't bid 2♣, but if I force a 2♣ bid.. both opponents pass out 2♣ undoubled.
This is on top of the usual issues where after I make a redouble suggesting I want to penalise the opponents, partner often butts in with bids rather than checking if I want to penalise first.