It isn't the game managers duty to fix the inflation and it shouldn't be. The economy will balance itself. Your money will lose its value if you don't work on making more money. I have been keeping my money since a while and I have quite a bit and yeah possibly with a few weeks with multiple accounts on berry planting people can make more money than what I had for a while.
No, I'm not advocating because I'm not farming berries either but I also know I could do the same if I really wanted. Its a very simple process. People are farming berries and getting their payment for their work. Nobody was complaining when Island runs and npc payouts was a thing, there isn't much of a difference. The only reasonable thing they can do is nerf it slightly or add more pokeyen sinks in the game. But It doesn't means they have to do it. Yeah, there is a huge influx due to there is a method of basically generating in game money, but you can also use the same method. If you aren't using the most efficient method of gaining currency in an mmo, the people who does that aren't to blame, the fault is mostly on your own end.