3 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

If I use this card, do I lose 2 memory every time my opponent attacks with a Digimon?
Your opponent loses the 2 memory. The memory marker will be moved 2 spaces towards you every time your opponent attacks with a Digimon.
Ruled Mar 28, 2024
I use this card. During my opponent’s next turn, if they play a new Digimon or move a Digimon from their breeding area to their battle area, will those Digimon have “<When Attacking> Loses 2 memory” from this card’s effect?
Yes. The effect reads, “All of your opponent’s Digimon,” so any Digimon that enter the battle area after you use this card are still affected.
Ruled Mar 28, 2024
I use this card. During my opponent’s next turn, they attack me with their Digimon's <Blitz> effect while I have 1 or more memory. Does my opponent still lose 2 memory?
Yes. Even if you have 1 or more memory, the attack with <Blitz> still takes place during your opponent's turn, which means that this card's effect is still active, and your opponent still loses 2 memory.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.