Perhaps these acquisitions are not so much a bet on "neo-banks", but rather serve as an insurance to make sure they never grow large and pose a threat?
BBVA Compass(1) was 30th in the ranking of the 50 largest banks in the U.S. (SNL financial data from 2013), definitely not the biggest one but it's harsh to say that it barely had any footprint.
You can disagree with whether this means they had barely any footprint or not, I guess that's semantics, but it certainly makes more sense that they would buy them to expand, not to get rid of a competitor.