I'm still receiving daily emails from "Lisa at manybooks.net." I opened the one that I received today, just fine. The message listed about a dozen ebooks.
There was a link, in the message that I opened, to
the website for manybooks. It opens just fine for me. Could it be that somehow the messages that you were receiving are now being routed by your email program to the "spam" or "trash" folder? Or maybe you were kicked off of the mailing list for some unknown reason?
I signed up for their email messages a long time ago, but they weren't on my short list to check every day. So, I've very, very rarely opened one. Same for checking out
their website. The website claims to have more than 50,000 (no, that's not a typo) free ebooks.
I think that I'll check their emails and website more often now, to see if I'm missing some good bargains.