Luckily, anyone can open a free Weet account at any time! A free account gets you all the same features as the Business plan. Upgrading to the Business plan allows users to access all of their weets... there is not a limited access to weet history as in the free plan.
The Enterprise plan will offer trials on a case-by-case basis.
Related Resources:
How do I create custom virtual backgrounds for my camera?
What is the difference between a work and personal Workspace?
What is a Workspace and how do I create one?