On my last two flights I received free standard (not streaming) Wifi. Flights were IAH-AMS-JNB on 787 and 773. Both time I selected standard (no streaming option offered on the 787 flight) and instead of being redirected to pay, a free voucher appeared as if I had paid. on the JNB flight i selected streaming and it wanted me to pay. However, selecting standard I was again given free access.

I'm a Delta Diamond and was in J cabin.

Is this normal? Is this new? Did i just win the lotto?