openEtG is a TCG
In general it doesn't matter. EtG's grinding has always been about upgrades, so it's mostly a matter of electrum. Now that arena's down that's moot. oetg is moves grinding towards cosmetics. A good card game shouldn't put pvp behind grind to win or pay to win. Unfortunately the money in card games decides to go for the easy bait of putting the money in getting cards rather than taking a lesson from LoL & keeping money for cosmetic cards
Imagine if Hearthstone or MTGA made cards freely available, leaving buy in for golden cards, alternative art, etc. That's much more important than whether players can trade amongst themselves to counteract variance