[Karen Hardy]

The act of teaching something makes the taught item marketable.
That's the way it works. One does not teach something in order for
the person who makes it to have to hoard it.

Imagine if all teachers were like that. In high schools, teachers would
show you how to do math, but you weren't allowed to add stuff up outside
of school.

Ridiculous.

If someone posts a tutorial, whether free or paid, you absolutely have the
right to begin making AND selling the item. You have paid for the knowledge, or
it was offered up freely, and there is no "taking it back."

Word.