These exploits work on a hardware level, and do not require the malicious app to know what else is running. For example, a VM does not know what other VMs are r

These exploits work on a hardware level, and do not require the malicious app to know what else is running. For example, a VM does not know what other VMs are running on the same host in AWS, but Spectre/Meltdown still affected AWS hosts. They are reading data other apps have written to memory.