Some great information and food for thought, @johnmclear is not trying to sell the product. Relevant to @dgilmour’s link to creativecommons & #OER I don’t think this is the time to pivot tools, but one to keep in mind.
That’s the honest truth about modern software, it’s vulnerable. It’s ALL vulnerable so you have a choice to use something that is honest about it’s vulnerabilities or hides behind the door of closed source providing an ignorance is bliss situation.