@Joe@toot.wales @firstname.lastname@example.org @kithop basically yes.
Funkwhale instances accept one or multiple users. If you join an existing instance, like https://open.audio, you'd have to request some storage space to upload your work.
If you set up your own instance, you can of course do what you want, but regardless of your choice, if you share your work publicly, it will be eventually federated to other instance, and embeddable via an Iframe on third-party websites
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