From the (lengthy) release notes:
BBEdit 11.6 introduces a new demo model in which its complete feature set is available for the first 30 days of use.
At the end of the 30-day evaluation period, BBEdit will remain permanently functional with a revised feature set that includes its powerful text editing capabilities but not its web authoring tools or other exclusive features. BBEdit’s exclusive features may be re-enabled at any time with a purchased license.
If I’m reading this right, the most powerful text editor available for the Mac is now — effectively — free. Even with the limitations they cite, that’s astonishing.