I learned go from Edward Lasker’s book, Go and Go-Moku, which I found among the 12,000 books of my father’s library when I was nearly 12. For my 12th birthday, I asked for and got a cheap go set (still the only one I own). My friends lost interest after losing a few games. There were virtually no go players around in those days. While in high school, I met one, a university student, and we played about twice a month for a couple years. In college, I met a few more and played sporadically, while gathering two or three go books along the way.
After college, go fell by the wayside for more than 40 years. I discovered a small, informal go club at my county library in 2016 and plunged in with delight. They told me about OGS and Sensei’s Library, and I found the streamers through comments in the Forum here. I guess I was probably somewhere between 10k and 14k in my first go around. I knew the basics, though without any joseki or fuseki, I had some sense of the big points, and I used to regularly solve the 10k-level tsumego in Games and Puzzles magazine.
I surmise that the streamers have had a profound effect on the spread of go in the West. They are certainly a great resource for learning go and improving.