Takaya has been a Professional Manga artist for 30 years, with both a legitimate publisher, international releases, and even multiple animations made from his work. It's a little different for him when people are complaining about his output when people have to pay money for his releases ( again, there are a lot of people here PAYING for the content as well as in Japan itself). The sense of entitlement that comes from this may not always be rational... But for people who have bought 32 volumes of manga with the hope that they will actually see it end? It is kind of warranted in some cases.
Now Takaya did say that he was very aware that people want to see this series finished, and hopefully this downtime is related to this... But since they never actually tell us why there is a hiatus, we are left to wonder just why it is happening.
For instance, when he put Guyver on hiatus a few years ago to finish off an old old manga series he did in the past called Hades Project Zeorymer... We didn't find out until later from another publication as to what "Chimi Morio" ( his pen name) was up to.
So while I do agree that people who are expecting free manga shouldn't be complaining very much, there are those who do pay for it, and you can't always assume people are reading it for free. And when crap like this happens, complaining/speculation is pretty much always a given.