There's not any filters in the \WP_User_Query class for modifying the SELECT statement in order to customize for cursor pagination, so we'll need to come up with another way to add cursor pagination for users.
See other cursors implemented here: #114
This does not sound like a fun issue to tackle...
This might be puntable, since it _technically_ works right now, just not in a very relay way.
I believe the work done by @epeli should make this an accomplishable task now 馃槃
Can probably get this on the roadmap for the next release 馃
I can try to poke at this.
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I can try to poke at this.