I was not very clear, the countersuit failed and the arbitrations were allowed to continue, but many of the fools withdrew after being doxxed and the threat of legal costs, not to mention most of the ones that were withdrawn were closed without a hearing, so minimal costs for Patreon.
The whole thing was presented as free, without risk, and it was supposed to help him get back on Patreon. So, when the reality knocked at their door, with the need to have a lawyer (that he payed), the risk to be sentenced, and when it appear that he didn't really cared to be back on Patreon (he asked few millions to close the case by a conciliation), there were suddenly found less people ready to help him.
The funny part is that in a way he won. Patreon was sentenced because the ToS change haven't be done like it should have, or something like that. But he never came back on Patreon, and when Patreon discovered and banned a second account he had, he did nothing. So, I guess that his victory was way more symbolic than he expected.
We will never know since there's apparently a confidentiality clause but, accordingly to the information I can found, he don't looks like someone who won few millions, and more like someone who have to count each buck he spend.
The idea is still technically correct but [...]
The main problem is the number of people doing it. They were 72, it will never works with so few people.
Patreon was probably making around 10 millions benefits at this time (it was 7 in 2017). So, it would have been a bad year, but they could afford to loose 10 millions without it to have a real impact. Below 1,000 they had no chance to harm Patreon.
For it to works it also need a better reason to go on arbitration. Like you said, they were all dismissed without hearing, what mean that it didn't lasted years like they expected, and so there were no additional costs for Patreon.
In the end, between the failed counter-suit, the arbitration costs, and what they had to pay him because he won his own case, including their lawyer(s) costs Patreon have probably spent something like 300,000. I'm not sure that it prevented them to have more benefits than the previous year.