> adoption continues to increase over time

I see this statement over and over and wonder what it's backed by. Anecdotally it feels like adoption at the "businesses that take Bitcoin" level has been dropping steadily for the past few years - announcements of "X will start taking Bitcoin" have all but dried up and many of the businesses that did take it seem to have given up, especially so at the local level in locations that I am familiar with. I have no insight into adoption at the person-to-person private transaction level. Is there some reasonably balanced source that has a good analysis of adoption or is transaction rate being used as a proxy for adoption in these claims of increase?