"... what's the point of FreeBMD's continuing to work on this?"
Huh? Because as the name says, FreeBMD's transcriptions of the BMD indexes will remain FREE at its own website. This means that people who cannot afford the £80+ subscription to Ancestry will have free access to the BMD indexes as and when FreeBMD complete them and put them online - about 1.2 million distinct records every month.
What do you mean, "How on Earth did all that indexing suddenly become available?" FreeBMD is a
UK registered charity for whom volunteers have been transcribing the indexes for years - VERY accurately I might add, because every entry is double-keyed by a real human being. So that they can afford to continue their amazing FREE work, FreeBMD have licensed Ancestry to use their indexes for 1837-c1915.
Ancestry have more recently put up their own OCR indexes for the births and marriages from 1916 to 1983, and we all know how accurate they are!