The OP has their terminology wrong.
Tor is windowing libraries, not embargoing.
They are delaying availability, not denying it.
https://the-digital-reader.com/2018/...ibrary-ebooks/
It is a stupid, counterproductive move, given that libraries are known to be a net positive for sales by improving visibility of the works, but very much in line with historical BPH attitudes towards public libraries. Moves like this one, from 2011:
https://the-digital-reader.com/2011/...rom-overdrive/
If they had their druthers they *would* embargo libraries, permanently.
They still might.