After raising a $100M seed round led by Atomico, @CallosumAI Co-Founder @DanAkarca says one of Europe's biggest bottlenecks is psychological- we need to get more comfortable dreaming bigger: "I used to roll my eyes a little bit when people talked about ambition. I thought, is that really the bottleneck?" "Then I realised one of the things we can extract from Silicon Valley is that they have examples of actually making trillion-dollar companies." "Here we haven't got those examples, so it…