You could write any program in any non-toy language, of course. This does not make every language a good choice for a given problem.
Here’s some pretty detailed notes from Google about one high volume project they rewrote from C++ to Go.
https://talks.golang.org/2013/oscon-dl.slide#1
Use whatever language you like. Just because you like X and someone else likes Y does not invalidate either language.
And to you totally off base comment about cargo cult of web scale and ‘pump up their CVs’ .... in my case I happen to work with huge data (petabytes) so yeah it matters and has nothing to do with FAANG. In this context I have found Go to be an insanely great tool—-productive, reliable, maintainable, multi-core, networked and fast. Thankfully I will never have to write a line on .NET.