Seems like I can share - https://www.edslides.com/slides/view?s=PCVX3525
The sign-up pricing page is confusing. It lists a pro plan with unlimited sharing, but don't mention a comparison to the free plan, which also allows sharing. Seeing the pop-up, I thought sharing wasn't possible in free plan.
Thanks for the feedback, yes all the features are available and users can create up 2 projects before being prompted to upgrade. I'll amend the messaging to make that clearer.