Peter Thiel — co-founder of PayPal, Palantir and an early investor in Facebook — is known for his libertarian views, contrarian thinking and support for US President Donald Trump.

His private Dialog retreat brings together politicians, tech leaders and celebrities for off-the-record discussions on what participants describe as unconventional ideas.

DW's Melissa Chan speaks with tech journalist Fritz Espenlaub about Dialog, its purpose, and the backlash it has sparked — along with Thiel's political influence and Europe's concerns over US Big Tech.