I don’t actually think forms working after export was ever a planned feature. I believe it just worked due to how it was set-up, and it was never a promised feature. For example:
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Here is thread that is confirmed as a bug, of forms going through after an export: Form submissions go through after site is unpublished
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And also, if you look at Webflow’s pricing page it actually DOES say:
Can I host my site somewhere else?
On the Lite, Professional, and Team plans, you can export your website and host it anywhere you’d like. No attribution required. However, CMS Collections cannot be exported and forms (including site search) will stop working.
Here is a screenshot of that: https://cl.ly/1V0O1G0z2q45