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What vendor lock-in? They make it plainly clear how to export your data from BitWarden: https://bitwarden.com/help/article/export-your-data/

Personally I think it would be awesome if Bitwarden gave you the option to export your password vault as a KDBX4 file. What's the best way to fund a bounty program for adding this feature to Bitwarden?

KeePass has the ability to import Bitwarden JSON file so there's little need for the feature.

There might not be a need but I like the idea of being able to use the Bitwarden client on iOS/Android with a KDBX4 database file from KeePass(XC).

Bitwarden is 100% open source. You can run your own server. There is no vendor lock in.

Not an excuse for poor export capabilities but you can absolutely DIY with bitwarden-cli.