Yeah that's the huge exploit part. I suppose where you got 260 fight cap for platinum was 2 sectors x 130 each? Still really high, just on estimate 260x10 days 2600 fights would be possible in platinum, 3200 fights on diamond, and 2000 fights on gold, following that idea. Insanely high totals still, considering with no attrition help or only modest help (1 or 2 camps) a fight limit of 50-100 per day is reality, and averaging 100 fights a day is 1100 fights by the end.
The Battleground farming is now worse than the GvG farming ever was. For those who don't know, GvG sectors only have 80 fights max possible, AND it costs to unlock slots and spend your own troops to fill it up, they're not automatic fights available like in Battlegrounds. Diamond league has 160 fights per sector and no one has to fill in troops for it. Farming Battlegrounds is literally twice the problem it was in GvG, but not being addressed. Maybe more than twice the problem, because in GvG farming, players did it for rank points and PvP tower score; farming Battlegrounds has a bigger incentive to abuse since players get diamonds, troops, fps, goods and all the rewards after each fight, plus the rank points and PvP tower score.
The GvG abuse was mostly "fixed" in 2016 by changing the rules to 1 release per sector per day so that guilds couldn't release the same sector over and over (up to 4 times per person) and kill it again for unlimited fights all day long. Guilds still found ways to farm sectors but that rule change stopped most of it. Farming was further fixed in 2019, when it was changed to be random troops whenever a sector is released in GvG, so that players couldn't pre-load a sector with champs and farm their merry little hearts out with easy auto battles for max points every day.
So there is some precedent that Innogames does care about farming, balance, and abuse of game features -- and yet this free attrition in Battlegrounds is allowed to go on with unlimited farming. Having 4 or 5 siege camps lined up in adjacent sectors leads to this: one person being able to solo farm multiple sectors every day for 11 days and get 2000-3000 fights (or MORE as pictured - that's over 300 fights per day average.) Makes a measly 80 fights of farming in GvG, even with all champs, look like child's play.