For anyone that Doesn't know what Proof of Keys is it was an Idea that began in 2018 by Trace Mayer on twitter that involved the Bitcoin community as a whole retaking control of their Funds if only for a day.
You already had the answer in the first line of your text, there is no point going over the rest.
What bitcoin community, how is this community defined? People that hold coins? They have different views, some are holders, some are speculators, some threat it just as money not interested how much will be worth tomorrow but how much in $ they can make today using it. There is no global community, there is no local community with the same thinking, the same way of doing things, and more important with the same knowledge.
A guy started a movement on twitter, so? Do you think just because you have a million followers the whole world cares what you do? And what he is doing is nothing other than preaching to the choir, the ones who really are interested in this movement where the guys who already had their coins in their own wallets, the rest...well, simply put, they don't give an f word!!!!
You're witnessing the consequences of something starting to go mainstream, ideals are forgotten and interests are taking over, it happens with everything.
Quadriga ofcourse is not a great example here since despite being exposed a lot of people continued to deposit more money into It, but like you said some people will never learn. ( similar situation happened with bitkonect with people giving them money upto a day before they went belly up)
And they will never learn, people are either blinded by greed or overcome by laziness, the Quadriga story will repeat itself, same for phony ICO or IEO or DeFI, people are cheering for services that provide ease of usage, for crypto banks, for a lot of other services because they don't like to have this burden on their shoulders, they like to have somebody else to take care of it for them.
So, proof of keys, nothing will come out of it!