I agree with a lot of what you say, Jack, about online material. Maybe the reason there are not so many of them is that it is difficult to make money that way, and there is perhaps more prestige in publishing a book.
They are not structured as a course, but you might be interested in taking a look at videos produced by Jane Nickles. I used to have a page that referenced a whole pile of them, and checked out a lot of them. They are no longer on that page, but if you google, or search youtube, you will find them. Generally speaking[1] I thought they were very good - maybe not exactly inspiring, but solid as far as the information content goes.
Real-life taught courses are as good as your teacher. I know many people who got a lot out of them, but I had a very bad experience and quit after a couple of lessons. I'd recommend getting personal recommendations if you go that route.
[1] Sometimes, she does seem to have some strange ideas, and I have just posted separately on one of these -
viewtopic.php?f=3&t=27110