I mean there's not nothing you can do. You can still grab the source to old Reddit and it's just a matter of gluing the old UI to the new API like all the 3rd party clients do.
Not trivial by any means but there's a lot of prior art floating around you could pull from.
Sure they could pull API access and be more hostile to scrapers but that's the current escape hatch for people who would have left because of the redesign.
