But don't forget that one of the main reasons for BT creating BT Sport was to gain more phone+broadband customers. This is why they offer free access for BT phone+broadband customers.
So they might lose the £12/£15 Sky subscription fee, but they will gain £30+ revenue for the new BT phone+broadband contract. Using that argument they should make the free BT Sport service available on as many platforms as possible to try and lure as many new phone+broadband customers as possible.
BT Sport isn't actually available on TalkTalk TV. Plusnet currently just do a half price BT Sport on Sky offer, but Youview from Plusnet is due to start up later this year once trials are completed.
Would love see a bt sport app for ps4, I just seen today that sky go is coming to ps4 this summer.