How to punish copycats in chess?

1 e4 e5 2 Nf3 Nf6 3 Nxe5 Nxe4 4 Qe2 Qe7 5 Qxe4.

one specific line thats interesting

d4 dr c4 c6 cd cd nc3 nf6 nf3 nc6 bf4 bf5 qb3 na5 qa4 bd7 qc2 e6

what helps is thinking calmly, playing chess... wing gambits, creating hooks, sac pawns and pick em up later to punish copycats, make good moves first, get them to react and then you got them maybe, sometimes

After a few moves I consider a change in my opening theme that is counter to what preceded.

1 e4 e5 2 Nf3 Nf6 3 Nc3 Nc6 4 Bb5 Bb4 5 O-O O-O 6 d3 d6 7 Bg5 Bg4 8 Nd5 Nd4 9 Nxb4 Nxb5 10 Nd5 Nd4 11 Qd2 Qd7 12 Nxf6+
lichess.org/forum/general-chess-discussion/how-to-beat-a-copycat

Play the horde chess. He cannot copy you then

Queens gambit

"... In actual fact, [(after 1 d4 d5 2 c4)] 2...c5 is not a bad move at all. ... I think the truth is that 2...c5 is a very good surprise weapon, but that if White knows his stuff, he can oblige Black to be very careful just to stay on the board. ... 2...c5 can be considered a modern move, designed to ambush an unsuspecting opponent. ..." - IM Andrew Martin (2016)

related to that, this would be a fun bot:

A bot that plays only black and always copies white's move, whenever it is legal to do so (if copying not legal, play top engine move). It would be easy of course to win against the bot with the tricks mentioned above, but it would be quite educational. (;

EDIT: Ah, such a bot actually existed, but at least this particular one seems to be offline permanently:

lichess.org/@/CopyCatBot/all

A story used to do the rounds (sorry, I cannot remember where I read it or who to credit) about a club champion who found herself without a game at the local chess club when her opponent went home early. Fortunately for her it was near the end of the evening, and a man turned up to pick up his daughter who was playing another game.

The champion asked the man if he'd like a game while he was waiting for his daughter. He said that he didn't really play, but she insisted, so they sat down at a board.

The club champion took White and opened 1.e4. The man thought for a moment and played 1...e5. White decided to play the King's Gambit with 2.f4 and was surprised when the man replied, without hesitation, with the unfamiliar counter-gambit 2...f5!? The champion furrowed her brows for a bit, then decided to continue the counter-gambiteering with 3.d4 and the strange game continued 3...d5 4.c4 c5 5.exf5 exf4 6.dxc5 dxc4.

White decided at this point that her best course of action was an exchange of queens and played 7.Qxd8+. Her opponent had no hesitation in picking up his king, moving it down the e-file and capturing the white king with it. "That's not a legal move," said the champion. "Isn't it?" replied the man. "I don't really know how to play, I was just doing what you did."