Despite all the martech products available today, custom software is alive and well.  About 60% of US and UK marketers told Mailjet they have built their own marketing technology and another 20% have a project under way. Home-grown systems are harder to use but the cost of switching keeps many companies locked in. Click here for a summary and here for tons of interesting detail on pros and cons of each option.

Adtech vendor MediaMath has pledged to deliver a “100 percent accountable and addressable supply chain by the end of 2020”, via a cooperative project called SOURCE. It’s a bit unclear what’s involved (at least to me), but the commitment to “righting the wrongs of a digital advertising industry” that has “gotten lost in fraud, waste, and irrelevance” taps into a mad-as-hell-and-we-won’t-take-it spirit within the advertising world and beyond.

Retention-oriented CDP CleverTap has purchased app marketing system Leanplum.  The deal will give CleverTap a new set of advanced personalization tools and greater geographic reach.  Price was not disclosed.