It's all about the tax is it?
I may be wrong, but it is my understanding that if they want to avail of Ireland's low corporate tax, they only need to incorporate a new company and transfer any patents to it. Dropbox as we know it then licences the patents form this new company. The normal dropbox pays so much for patents from this new company that it barely turns a profit (so less tax to pay on it), and all profit is with the new company, in Ireland.
At no point to they need to physically locate their server in the Republic to take advantage of this. I think it is a bit of an easy statement to say "ahh yea, tax dodgers", without looking into the other reasons they may be locating in Ireland, ie. Highly educated work force, eurozone, friendly data rules, no GCHQ and NSA.
Yes I get tax is a factor, but could we please try to look beyond this at least sometimes? The tax argument is a bit shallow in fairness