Another good example is this one. This guy said, "as they say", so I wondered who does he mean by "they" because I've never heard the expression said that way before. It turns out it was himself.
It means everyone. It's a very commonly used phrase where I originate from (London).
https://idioms.thefreedictionary.com/as+they+say#:~:text=A%20phrase%20used%20to%20introduce,as%20they%20say%2C%20is%20history.
as they say
A phrase used to introduce a well-known or commonly used saying.
And the rest, as they say, is history.
as they ˈsay (also as the saying ˈgoes) often used before or after a saying or an idiom: We can kill two birds with one stone, as they say. ♢ He was, as the saying goes, as mad as a hatter.
~Advertising a mixer and getting caught on blockchain evidence is quite ironic.
/Scratches head in disbelief.