Web sustainability is an essential topic, which the W3C started working on : https://www.w3.org/community/sustyweb/

Some element can also be found here : https://sustainablewebdesign.org

Webflow is offsetting its carbon emissions but there is much more to do by reducing them in the first place.

There could be courses or lessons on the Webflow online university (https://university.webflow.com) to help creators understand sustainability best practices.

Webflow could also implement efficiency best practices and encourage sobriety for creators through nudges and guidelines. Raising awareness on this topic is an important step to take.

For example, this could be implemented through a Carbon Website Calculator Badge : https://www.websitecarbon.com/badge/

Either, I think sustainability should get more attention and discussion to help Webflow and creators reduce the environmental impacts of websites created thanks to this amazing tool.