That was an incredibly misleading article. If you check the links, you find the following:
1. P&G didn't turn off that spend, it shifted it to other marketing platforms.
2. Chase didn't change its marketing spend, it just concentrated it from 400k sites to 5k sites.
3. Uber found out that their agency was committing fraud and AFAIK the case is still being litigated.
I hate being that guy, but check the links. Those reporters really must have an agenda or something (or are just struggling to get the clicks, so they need to make a story out of nothing).