tldraw: The 47k-Star Whiteboard You Can Fork but Cannot Ship Freely — A License Story Disguised as a Review
tldraw is a 47.5k-star infinite-canvas SDK — but since v4.0 (September 2025) it is source-available, not open source. This deep dive covers the license change, the production license key, the watermark, how tldraw sync actually works, what self-hosting still gives you, and why it belongs in the same conversation as Cal.com and Excalidraw.