Apparently you missed where Square Enix wants people to do these types of things.
Leveling crafters is an investment.
Purchasing housing for community events is an investment.
Submarines are an investment.
Materia for PvE are an investment.
People taking orders for raid groups that need day 1 gear is an entrepreneurship.
Artists advertising the game and creating content for players is entrepreneurship.
Half of the modding scene is entrepreneurship.
People selling levekits is entrepreurship.
People giving out financial loans at an interest rate on JP is entrepreneurship.
People renting out housing to venues is entrepreneurship.
People getting paid in gil to run content is entrepreneurship.
Courtesan work is entrepreneurship.
The PvP community that hosted it's own PvP tournaments is full of people who invested billions of gil to provoke excitement and recruit people into the world.
Gambling communities are entrepreneurship.
Do you afk in Limsa? Because you probably can't stand anywhere for more than 10-60min before you see someone that's making an investment or doing entrepreneurship in shout chat or PF.