I may just be a dumb Yank, but...
Nice piece, Pablo (as always) breaking down this partial but substantial list of fears the #Remain movement has. There will certainly be some pains felt from the adjustment period.
For my own part, I have my respectful rebuttals to those fears (which I recognize that you are merely listing and might be but are not necessarily adopting). Adressing this slide by slide:
#1: Yes, when you have to pay more for skilled local labor instead of "insourcing" through cheap migrant programs where you can pay people pennies on the dollar, I suppose that does technically qualify as a "difficulty." (q.v. H1B visas) tl;dr: Boo hoo.
#2: The EU needs the UK more than the UK needs the EU.
#3: One word: BMW.
#4: More opportunities will be created in the UK, however, as a result of the break.
#5: This I actually do agree is a real, potentially substantiated concern, depending upon how the potential BoJo administration wants to handle things. (Despite EU privacy sensitivity, David Cameron was not exactly a champion for civil liberties either.)
#6: I'd like to see stats on this because --respectfully -- I find this prediction very dubious. The UK's GCHQ was revealed to be just as guilty as the NSA in all the surveillance that led to extremely heightened nephophobia and data sensitivity in the EU. If the UK loses the opportunity to host datacenters, it will be because of a continuing trend since Edward Snowden's leaks -- not because of the Brexit.
#7: Maybe, but for the most part very doubtful -- and where will they move to, besides? Major EU countries like France aren't exactly noted for being tax havens. Plus, with all the uncertainty surrounding the EU's stability now that one of the few countries that was actually one of its primary financial supporters has left, I sure as shootin' wouldn't want to relocate my HQ to the EU right now. Besides, London has long been a financial and industry center in its own right long before the EEC-cum-EU.
#8: Again, the UK was a substantial contributor to those EU funds. Sure, some opportunity will be lost to London -- and a lot won't.
My take: EU tech will feel the pain much more than UK tech will -- especially because of many EU organizations' data-privacy-extreme isolationist policies.