If someone were to try to do a bulk download of the data (well, or whatever they thought was the most significant data) through the API for preservation purposes, might it put an undue load on your server infrastructure? Some kind of bulk data download might be useful insurance there.

There seem to be some interesting efforts to run SQLite in the browser so that server infrastructure only has to provide bulk data access, with precomputed indices to avoid full table scans; I wonder if those might be applicable here: https://blog.ouseful.info/2022/02/11/sql-databases-in-the-br... (though of course if you aren't using SQLite as your backend now it might be a headache)

Such an approach, if it were feasible, would have the advantage that bulk data downloads wouldn't look very different from normal use.