Nothing has surfaced for the past four years that all these vulnerabilities were revealed. Not a single piece of malware uses any of https://en.wikipedia.org/wiki/Transient_execution_CPU_vulner...
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That we know of! Since timing attacks like this probably needs a bit of machine specific tuning it's probably not that much of an interest to regular mass-market attackers.
But for APT groups that might need a wedge on particular machines it might be worthwhile, remember the length NSO group went with Pegasus.