I’m not sure that’s the case. I worked for Irish subsidiary of a financial software company. Management openly said the main reason we were there was for the tax benefit. We cut standard code for the product, then once a year had to fill out a form describing the ‘R&D’ component of what we had done. As I understood it, that was required for the tax treatment we received.
You get a 33% tax rebate via a research credit. You probably filled out a form for PWC to attest to that. There's 10s of 1000s of Engineers directly employed in R&D in Ireland, spanning automotive, telecoms, fintech, SaaS etc.. with a large number of companies receiving the credit.
We have a HUGE network effect now via the Silicon Docks and the other tech hubs around Ireland - Cork, Galway and Dublin are absolute inundated with groups of companies in certain industries. Seven of the ten of the world's top pharmaceutical companies including Janssen, AbbVie, Eli Lilly, Pfizer, Merck/MSD, Novartis, and Thermo Fisher Scientific are based within 50km of each other in Cork.
AFAIU it’s a soft requirement so that IE can claim that losing taxes is offset by employing (a few) people. The actual tax structuring discussed in this case and similar for other FAANG, is all about where the company is registered vs making revenue vs paying taxes, and how none of it is intuitively what you’d expect.
