Same with me but I chose to switch to the yearly subscription. I basically got ignored just the same.
I use Raindrop.io for now.
Maciej is aware of the outrage, if you can call it that. He seems rather hostile to those angry customers.
My hunch is that he got bored with Pinboard and plans to ignore it until it dies. Or breaks and then he does the minimum viable to get it duct taped again.
I personally like Maciej but just telling it like it is.
I decided to pay for 3 years to give myself enough runway to not think about it, I have 9 months left. So I guess I'm giving up and switching to self hosted.
I received an email from them asking me to move to a yearly subscription, although I could choose to decline
I chose to decline, mostly glad about the decision, I paid what was asked when I originally signed up