I would like to use the convert to pdf feature to occasionally capture and save interesting articles or pictures but I don't want to lock in to a subscription for this infrequent use. Can Adobe not provide a pay per use option or do I need to go after the various freebie bit less reliable apps out there?
You have options to subscribe to the plan suitable for you like choose to pay mothly or annually as per your requirement.
Please go to adobe.com/plans and choose the country you are in at the bottom left corner of the page and choose the product and plan best suitable for you.
Let me know if you need more help.