Reports indicate that as of February 26, 2019, Chase INK Preferred is no longer coding to earn 3x points on certain places which used to work. Three changes being reported are Venmo, Giftcardmall, and Simon Mall online (I believe that’s referring to simon.giftcardmall.com).
Still earns the regular 1x rewards, but no more bonus 3x earn. Big hit to manufactured spenders.
A reader comments that eBay fees also stopped earning 3x. There are likely some more things as well, probably due to some MCC’s being excluded.