A perpetual, irrevocable "lease" is just be a "sale". You are just selling a copy at that point.
Subscription-based/SAAS software is leased.
I know it's pedantic, but to me the key thing is that it is the rights themselves that are "licensed." Not specific copies. The license covers what ways you are and are not allowed to make more copies (that aren't just your personal copy). So e.g. Open Source/Free Software/Closed Source libraries can be "licensed" and copies of them can be modified and included in work you create according to the license.
But I don't think the software of a SaaS is leased, sold, or licensed. It's just a service that is available and perhaps promised to stay available for a term. And of course Monodraw is not a SaaS anyway.
Also not a lawyer. I have read more contracts than most healthy adults, but that is just as likely to be distorting as clarifying.
A perpetual, irrevocable, lease could be a thing.