This just means that, a month ago, there were more people who had time / were willing to write problems, and nothing else. It's even surprising that we can have a contest every week or so, because that means each week, there is a group of people who has dedicated hours to writing, testing, and rewriting problems. (If you try writing a problem yourself, you'll see that it's very difficult and time consuming!) Don't expect there to be a contest every day, because there aren't enough people to write and test contests.

Antontrybug rejected all the problems, and now the setters went on strike. Probably.

If you count for the past 3 months there were around (or exactly) 7 contests in each month. Yes, they are not announcing contest dates before, but i guess number of contests in a month remain the same.