EDIT: Here's a chart https://www.defenseone.com/politics/2015/06/nato-members-def...
"And when Berlin decides it will not pony up the promised 2 percent of GDP for its NATO contribution, other laggard countries follow its example. Only six of the 29 NATO members (other than the U.S.) so far have met their promised assessments." https://www.nationalreview.com/2018/07/nato-biggest-challeng...
The point is that NATO members agreed in 2006 to spending 2% of their GDP equally and then didn't meet it. They agreed again in 2014 and the ball still hasn't budged.
Pledges are pledges. Whether it's a pledge to cut carbon and stop global warming or a pledge to chip in for the collective defense of everyone. Imagine if everyone decided to cut carbon and then it turned out to be all just hot air. If you don't honor your pledges it will hurt the any sort of future international effort.
Boston Dynamics is trying to.