That they’re offering to sell this info to the author of the work involved does not make it okay. This is a frightening violation of the privacy standards that — a key point of comparison — libraries have long maintained with respect to reader activity. And selling your data to authors may only be the beginning.
I don’t want to read too much into the fact that they launched this “feature” on inauguration day. But the coincidence really begs scholars to become even more vigilant about where they’re sharing their work, and what networks they’re supporting as they access the work of others.