What are the biggest infrastructural bottlenecks hindering AI implementation?

Research in Action 2020

Interxion has conducted The Artificial Intelligence in Europe study with the research institute Research in Action, surveying 2,100 IT decision-makers from Germany, the UK, France, the Netherlands, Austria, Switzerland, Denmark and Sweden in order to find out how enterprises are leveraging AI. 

So what are the biggest infrastructural bottlenecks hindering AI implementation?