A board can contain unfinished thinking
Notes, research, decisions, and classroom plans are often useful before they are polished. People need a place to work privately, then choose when and how to share the result.
Sharing and discoverability are different
Canvio keeps workspace routes out of the public sitemap and marks them as non-indexable. That preserves direct sharing while avoiding the assumption that every board should appear in a search engine.
A product promise
The public website explains Canvio. The workspace is where people think. Keeping those contexts separate is a small technical choice with a large trust effect.