At the least the usage from the first week probably revolved around the dominance of Commander, though I would definitely believe that it is a pretty common pick in general even now. Even though the ideal Unaware Dondozo would not care about Opportunist, it still leaves a lasting impression when it activates visually and probably spread around quickly because of that. I do agree personally that it is in a very strong position right now and its impact is on another level, potentially going even beyond Neutralizing Gas in shutting down certain paths to victory by making them neutral and rather power creeping them out of the meta instead by making them a negative.I definitely agree that Opportunist is starting to get uncompetitive. It almost completely invalidates the effects of Weakness Policy, and heavily dissuades the usage of any stat-boosting strategy, such as Intrepid Sword, Download, Anger Shell?, and any terrain seeds. If we look at the usage stats from the first couple weeks of Gen 9, all of the top 10 most used Pokemon outside of Tatsugiri and Blissey have Opportunist in their top 2 most used abilities, with 21% usage on Dondozo, 33% usage on Mega-Heracross, 36% usage on Mega-Venusaur, 18% usage on Annihilape, 21% usage on Mega-Gengar, 22% usage on Mega-Sableye, 42%! usage on Baxcalibur, and 35% usage on Iron Valient. This is clearly demonstrative of the restrictiveness of Opportunist, as it is almost always the best and most used ability for any Pokemon. I am 100% in favor of either a suspect test or quickban.
Unlike Magic Bounce only reflecting the same move debuffs targeted at it, Opportunist can copy boosts from abilities and items on top of moves, which are the major drivers of the bulky statboost archetypes, and can always trigger on both mons, so at best you can't get ahead of the enemy and at worst both your mons are making both of them stronger at the same time while weaker individually. Even Unaware has the tradeoff of debuffs being ignored while Opportunist is a pure positive. The enemy getting momentum from your own buffs gives them a large advantage when your goal is aiming to do enough damage or build up/debuff to that point to win, so Opportunist ends up with multiple win conditions that also take away from the enemy's own goals.
EDIT: Also the Opportunist can also run Clear Amulet so it can't lose its boosts to make both buffing and debuffing harder on the opponent.
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