This is actually a good point, and something I've been wondering about too. What changed between the 90s and now, that Microsoft didn't get blamed for malware on Windows, but Google/Apple would be blamed now for malware on their devices? It seems that the environment today is different, in the sense that if (widespread) PCs only came into existence now, the PC makers would be considered responsible for harms therefrom (this is a subjective opinion of course).

Assuming this is true (ignore if you disagree), why is that? Is it that PCs never became as widespread as phones (used by lots of people who are likely targets for scammers and losing their life savings etc), or technology was still new and lawmakers didn't concern themselves with it, or PCs (despite the name) were still to a large extent "office" devices, or the sophistication of scammers was lower then, or…? Even today PCs are being affected by ransomware (for example) but Microsoft doesn't get held responsible, so why are phones different?