I've played over 700 hours to New Leaf back in 2013. The last time I have entered the island (like a year ago), people was talking about "unlimited fruit baskets", cheats, modifying different aspects of the town with the web editor... And even someone asked me how I got all my medals without cheating. Back in 2013, when 3DS cheats were not a thing, people used to compete for rare items, for example, the only way to obtain the beans box outside Japan was to buy one to a japanese, and today, people give themselves all rare items with... again, a editor. Same happens with bells, in the past it was very hard to earn millions of them, and even sometimes people did trades on the island. Now that is completely gone.
What i'm asking for is for a good anticheat system to avoid this, but with the Switch security completely broken and trash Nintendo anticheating measures, sadly, I think the game will be broken at launch.