to me, export should be easier and easier since you should just be able to ask the model for the memory files. it’s literally list text on a hard disk, even if there are some new formats in the future, they’ll just be files on a disk that another agent can then inspect and integrate. in fact, i think exporting data from services will become easier and easier since agents can do the work even if platforms try to block it.
Can't speak for muse and grok bot. But all other agents like openclaw, Hermes simply store then add files and it's trivial to migrate to another agent. Just point the agent to it