TBH Datacrons are much worse for F2P, as if a whale goes in hard on renting an advantage for 3 months, and has Lvl9-15 DCs on all their defensive/half their offense teams, F2P simply can't compete, no matter how focused their roster, good their modding, and high their skill. It's just a numbers/stats game. Doing 1 attack for 10 banners because you cannot win is not fun for either party. That said, I'd prefer the whales fight each other over who has the higher credit limit to keep the servers running compared to other predatory means of monetizing the game.
Still, them giving F2P only one conquest cycle to farm datacrons which last for less time basically says "don't even bother engaging with these, you poors, this is whale chow," which TBH is fine by me. You whales spend your thousands on rented advantage, I'll chill in K2 and earn a few hundred fewer crystals per month. Still those unwinnable matchups against lazy whales aren't fun.