If we're talking about ChipMixer, did they actually scam? Or did some government entities merely didn't spprove of their service? 
Yes, Chipmixer was an actual scam:
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Even my chips which I had in chipmixer service for which they claimed to "delete private" keys after 7 days or whatever, were seized/transfered.
and these transactions took place good 3 months ago.
It seems that you are right, whoever had vouchers or chips was left without them. I checked some old wallets older than 1 year that only contained chips from CM, and they were all emptied. Yes, it's a bit stupid that I didn't spend them, but honestly I forgot about a few $ in those old wallets. It's really strange that it wasn't all deleted, but now we at least know where even 7GB of data came from.Even my chips which I had in chipmixer service for which they claimed to "delete private" keys after 7 days or whatever, were seized/transfered.
and these transactions took place good 3 months ago.
It was still there today morning and even when the news broke here;
OK, I didn't know that part.
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Plus about "aggregation of stolen money", entities could also do that through JoinMarket and through those coordinators, no?
No they can't because coinjoins are non custodial. In fact, you often see these "mixing site" scams advertise themselves as coinjoin services in order to gain more victims, here's an example: https://bitcointalk.org/index.php?topic=5483310.0
You can see icopress is promoting custodial sites "Whirto", "Tengri", "Mixero" and "Unijoin" as coinjoin services. Now everyone who sends their money there will assume coinjoins are scams because they got their money stolen by yet another "mixing site".
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I truly believe icopress to be one of the good-actors in BitcoinTalk. Plus campaign managers are incentivized to be honest, because if they're dishonest, someone could give them a negative trust-rating and that would destroy their reputation, making their clients hire another campaign manager with a better reputation.
Perhaps he merely doesn't know that the actual CoinJoin is a decentralized protocol that mixes/obscures outputs? Inform him, so he can post a warning about the difference between traditional mixers and CoinJoins.