Update 21 March 2019. Szpunar AG opined today and suggests there is no such valid consent.
Update 14 November 2018 Hearing took place yesterday – Opinion AG scheduled for 28 February 2019.
A quick flag to those of you following consumer protection and the Directive (2002/58) on privacy and electronic communications. In Case C-673/17 Planet49 the Court of Justice is being asked to clarify to what extent a website which pre-ticks boxes in general terms and conditions (here: to share relevant personal data) is compatible with relevant EU laws.
File of the case here (in Dutch only).