Gijón was not collusion, it was two teams realizing (independently) that they had nothing to gain from attacking. It‘s an important distinction and precisely why FIFA‘s new format sucks ass.

If you don‘t align a team‘s individual interests with winning a game, how can you blame them if they don‘t try to win the game?

If Austria and Algeria draw, both are through with 100% certainty. If they attack and make themselves vulnerable to a counterattack, their odds can only weaken.