Legacy Cards, or Prior PKMN TCG Collection question.

Hiya. I'm sure this has probably been asked and answered before and please direct me if i'm posting this in error, but what technically became of my previous cards from the prior app? All in curiosity mainly, i've no qualms if they are technically gone so no complaint. I get that it's a different app too, and honestly prefer it over the previous one a bit so far. I just wonder, I was shocked to start reading all the changes, which i stumbled into right after my wife handed me the cards to redeem. We've played the phyical card game off and on for years so I racked up a decent online collection.