Originally it was a full free service, then they switched to full-pay service with little if no notice.
They converted my account to Pro without my consent and in October 2019 they charged me £11 for a monthly fee.
I complained, they processed the refund and confirmed that:
"We reviewed your activities, and we agreed to issue a full refund of the Canva Pro monthly renewal fee that you incurred. I have also cancelled your paid subscription, so rest assured that you will no longer be billed for any renewal fee.
The refund process may take up to 10-20 (maximum) business days to be completed, which may be faster, depending on your bank's internal protocols. You may follow up with them for updates.
On Jan 2nd I received a charge from Canva of £107.88 (equivalent of a Pro membership yearly fee).
I begged for a refund and clarification, however Nea (customer support in charge of my account) replied once and then disappeared.
Stay away form CANVA.COM it is a SCAM!