Today I visited the front page and was surprised to see that almost half of the questions were blatantly off-topic, and another chunk casually mentioned the possibility of a tool solving their problems but were otherwise not really posed as a typical Software Recommendation question. Curiosity got the better of me and I decided to write a SEDE query displaying the number of questions per week.
There's a large increase in the number questions from last December until February (from 10 per day to 40 per day) and 50% of them have been closed and/or deleted, compared to only 10% in the period before. March looks like the site is back to its normal level, but the state of the front page gets me a little worried.
Note that the decrease in # of closed/deleted posts since April 2018 can be attributed to the
RemoveAbandonedQuestions program of Roomba.
What could be the cause of this? Is another site on the network redirecting bad traffic to here? Has an unfortunate email gone out?