Oh, I am sure there are people that do their own reading of such content. Seeing how there even is a asmr crowd, it would be baffling if there were not some youtube channels about reading no-visuals games, and relying on their charismatic voice.
But I also guess that the rarity of such things has to do with how unpopular text only games are, in comparision to ... all other games. Even the https://itch.io/games/tag-text-based games usually use still images for flavor, but just do not have active responsive graphics, like moving sprites and such. Most people probably consider visual novels to be text based.
I guess you would need a popular purely text-based game and just search for let's play videos of that to find such content creators. I am failing at that first step, as I do not know such games.