This is the most significant hurdle. Notability uses a variable "allowance" system. If you take a high volume of notes, you may eventually be blocked from making further edits until your allowance resets.
A: Yes. Notability offers a "Starter" tier that is free to use forever. It includes essential features like writing, typing, and audio recording. notability free version
You can use the pen, highligher, eraser, and lasso tool to arrange your notes. This is the most significant hurdle
*Note: The "3 edits" limit applies to new notes created after the subscription rollout. Old notes (created pre-subscription) remain fully editable. notability free version