I don't know where you are from, but in the US the policy is 14 days. So:
1. someone buys an SE, and miraculously in 14 days comes to their senses and realized they bought a budget phone that is missing features. They exchange it for a flagship. Apple wins.
2. Same scenario but customer wants Apple and doesn't want to spend money, ultimately they keep the phone. Apple still wins.
3. Same scenario but phone gets exchanged for some budget android device the buyer ultimately doesn't like and repurchases the SE. Apple wins.
4. Same as above but buyer keeps android.
So Apple has it covered in 4/5 scenarios.
/sar