.. all depends what you call cloud
Lots of devs make use of some google apis / tools
Arguably this is "cloudy" (e.g. mapping based APIs, play store, google drive, google pay etc.) - devil is in the definition of cloud - just looking at running VMs, databases, apps etc. in the "cloud" is but one interpretation.
.. Being serious, really hard to pin down whats meant by cloud - ask different people, typically get different answers (obviously depending on their use knowledge & experience) - some people I know who use social media such as FB, Instagram to promote their small businesses ("makers" so sell stuff that photographs nicely so social media images a good promotion tool) regard that as cloud...(after all its hosted externally, FB even lets them make sales so is cloudy ecommerce as far as they are concerned)
I'm sure there probably is some "official" (to some degree) definition somewhere, but its not obvious in real world usage of the term cloud.