Besides them being different courts, those lawsuits might actually be somewhat different because, while they all wanted to stop adblock from blocking theirs ads, the plaintiffs might have used different approaches and accused adblock of violating different laws.
I haven't looked up the past lawsuits, but IIRC another article about this most recent case, this time the argument went along those lines:
1. The newspaper and adblock are competitors because of the acceptable ads program. The court agreed with this to a certain degree, at least to the extent that it agreed to hear a case in which adblock was accused of being a competitor who is applying unfair business practices violating German laws regulating fair competition between businesses (basically, one boxer was complaining to the ref that there's a guy in the ring who keeps punching him in the nuts)
2. The actual complaint was that there's an "implicit contract" between the newspaper's website and its users (i.e. users get articles in exchange for viewing ads) and that adblock is injecting themselves into and actively interfering with the contract between a competitor and the competitor's customers.
That's the contract which the quote
users have the right to block those or any ads, because no such contract exists
in the /. summary refers to.
Obviously from the quote, the court didn't agree that blocking ads is as trying to sabotage a competitor's contracts.
Anyway / tl;dr:
This case was about (specific) unfair business practices.
An earlier one was IIRC about adblock employees' sales pitches for "Acceptable Ads" (i.e. whitelisting in exchange for 30(?)% of your ad revenue) being essentially an extortion/protection money racket:
"Beautiful website and traffic stats you've got there; would be a shame if something were to happen to your ads..."
Other were about..I don't remember..maybe a general "they're 'stealing' from us".
One lawsuit might have been about whether removing the ads can be considered copyright violation because it's altering the appearance of the site (creating a derivative work) without the original authors permission.