Sure, won't be able to underpay people so easily as they have done with EU nationals and that is a good thing.
But I appreciate that cheap staff is always a boon for any company in whatever industry, but that's not fair on the people though really.
As for the scare tech founders off aspect, the article seems to slant it's focus upon European ones and that may well be true, more so as the UK will not be part of the EU.
Which in effect means that the playing field is fairer for all non-UK nationals as it removes that EU national privilege.
But let us see how it pans, and would be great to tag an article for review a year or two later on in which clarity and actualities can replace speculation.