Hmm. Don’t like the privacy policy: Data Pasted On The Editor We do not store any data pasted into the editor to our database without the user doing it manually. The data is processed on the client side and […] can only be manually saved to our database with the user's consent.
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You can run it in an isolated docker container if you're worried.
Though it looks like it only sends data to their server when you want to convert to a different format or save as an image which is what that policy is referencing.