Apple should not take any action. Imposing further restrictions on macOS would be unjust for the majority of users simply because some people choose to disregard clear warnings.
Decades ago, when software warned users about potential dangers, they would either accept the risk or avoid it. Nowadays, software has been so infantilized that people expect a guaranteed positive outcome, even when ignoring warnings, while "free thinkers" online argue that every warning is a false positive.
Philosophically, I don't think we should cater to this mindset. If someone decides to fall prey to an evident scam or install malware on a critical system despite clear warnings, that's their prerogative. This principle holds true beyond just software.
I genuinely dislike the trend of dumbing down and infantilizing everything in the world. This includes simplifying education to stifle exceptional kids, prioritizing clickbait over nuanced news, the prevalence of exaggerated content on social media just because it's easier to consume, watered-down movies and music designed to exploit mass audiences, political populism obscuring real problems, a flood of shallow literature, and suppressing innovation in technology due to it being inherently risky (like the slow pace of space exploration-related advancements compared to the 1960s). Regrettably, software has not been spared from the "dumbing down" to accommodate the lowest common denominator. This philosophy leads to decadence, disempowerment, and a loss of richness in whatever field it infiltrates. In my view, it is regressive.
What has happened to critical thinking in recent decades? It used to be sufficient for us to navigate life despite a little danger, challenge, and risk. "Danger" should not be a shunned taboo concept, it is an inherent part of life.
In short, use critical thinking, don't listen to forums that say WhatsAppCracked100PercentSafe.apk/.dmg/.exe is not a security risk. Or take accountability for your actions if you still install it — it is your prerogative. But it shouldn't be anyone else's responsibility to make sure you don't harm yourself. Same as in other areas of life.