I'm in a 3p tourney game, near the end. I'm in 2nd place, about 10 points ahead of 3rd, the leader is 40 points ahead.
The leader had the opportunity to end the game by finishing the terraforming but chose not to, allowing it to proceed for another generation. Instead they have chosen to take multiple actions which are exclusively against me rather than the player in 3rd and have give no real benefit (e.g., Power Supply Consortium when they're already making lots of energy). This was annoying but I was prepared to let it go. But then, after the 3rd-place player had completed the terraforming, the leader spent 8 Titanium to play Big Asteroid, which raises the temperature twice (so no effect), gains 4 Titanium, and optionally removes 4 plants from a player, which was me. So effectively they spent 4 Titanium to remove 4 of my plants (the other player also had more than 4 plants), which will probably cost me 2 VP at the end; in other words they took an action which was detrimental to themselves and to me and I therefore assume was intended to help the player currently in 3rd place. I fully expect the leader to fund awards which will help the player currently in 3rd place.
When I find myself clearly in the lead I try not to influence the battle for second. For example, when I could remove plants from either of the other players, I generally choose not to do so. But I understand that not everybody has the same opinion as me. However, playing a card that gives you no benefit (and in fact damages your own position) with the sole intention to damage one of the other players crosses a line I think.
The leader had the opportunity to end the game by finishing the terraforming but chose not to, allowing it to proceed for another generation. Instead they have chosen to take multiple actions which are exclusively against me rather than the player in 3rd and have give no real benefit (e.g., Power Supply Consortium when they're already making lots of energy). This was annoying but I was prepared to let it go. But then, after the 3rd-place player had completed the terraforming, the leader spent 8 Titanium to play Big Asteroid, which raises the temperature twice (so no effect), gains 4 Titanium, and optionally removes 4 plants from a player, which was me. So effectively they spent 4 Titanium to remove 4 of my plants (the other player also had more than 4 plants), which will probably cost me 2 VP at the end; in other words they took an action which was detrimental to themselves and to me and I therefore assume was intended to help the player currently in 3rd place. I fully expect the leader to fund awards which will help the player currently in 3rd place.
When I find myself clearly in the lead I try not to influence the battle for second. For example, when I could remove plants from either of the other players, I generally choose not to do so. But I understand that not everybody has the same opinion as me. However, playing a card that gives you no benefit (and in fact damages your own position) with the sole intention to damage one of the other players crosses a line I think.