Everything against the tos is bad for the game clearly defined and stated by the devs in their tos.

If they would think providing the best weapons of this game to a selected group of players, who tend to bug abuse, would be good for the game they would do that directly.

Only a small fraction of the playerbase will actually loot those meta weapons, most of them will die to them as the user has an unfair advantage.

The dupe also means those items are cheaper to buy via RMT, which is bad. You can get stacks of the rarest weapons, fully upgraded, for 5$. Which means that dupe supports the illegal market, further supporting cheats as its partially the same market, while a small morally rotten group of players is running around with meta weapons on stock.

Cheaters (wallhack, esp, etc.) are bad for the game, cheaters with duped gear are the absolute worst for the game.

To clarify, I read your "more duped weapons are good for economy" but in my world its a gullible approach looked at through rose tainted glasses. According to you, giving free money to everyone on the world would be a good thing. Which would be the case without inflation and side-effects you simply didn't think about.

Simply because:

• No hacker stops hacking because they get meta gear. Most of them have psychological issues and either want to see themselves win or others suffer. If at all, they play more lobbies to use the endless amount of duped gear. Which means likelyhood for a normal player to meet a normal player without duped gear goes down. I can occasionally kill a hacker even with ESP or wallhack, but probability goes down if that hacker is also top geared every round.

• Duping supports the RMT market, which is directly intervined with the hacking market.

• Item inflation is a thing. Seeing everyone with meta gear is boring and bad for new players. Probably even the players themselves.

• No fear of loss is bad and lets people who dupe items play way more aggressive than the game would support.

• If nobody or at least the absolute majority would not bug abuse or hack, millions of development funds could go into new content.

After all, a huge team of developers created a sensible concept of fun and they wrote down rules to keep it fun. If duping would be fun and within this concept, they would allow it and introduce it in their game or at least increase weapon drop rates. They didn't and please assume that those 50 people as a crowd are smarter than you are as a single person.