Well, I emailed Mypoints, asking why HH had disappeared, and got the following answer:

"Thank you for contacting MyPoints Member Services.

Unfortunately, Hilton Honors has recently been unable to process
MyPoints redemption requests in a timely manner. In our efforts to provide
the best member experience, MyPoints has indefinitely suspended its
relationship with Hilton Honors and removed them from our Rewards
section. We apologize for any inconvenience and appreciate your
understanding."

Maybe if enough people emailed them polite inquiries .... tls