Portugal has been handing out extremely desirable EU residency to very wealthy people for more than 10 years, in exchange of real estate investment. I don't blame them, together with Greece they were the hardest hit by the last global crisis. But of course that was going to noticeably drive prices up. A lot (most?) of those investments are now airbnbs which is the real problem they have. I don't think this can be compared with the recent wave of nomad visas that are little more than extended tourist permits.