I think that the real objection by the EU all along has been that the RBI/CBI programs have been…indiscriminate. If you dig through the various memos/etc from the EU, they have called out some fairly lazy practices - no vetting criminal records or backgrounds, no followup on investments, no evidence of the investments having any sort of social good, no good documentation processes, just rando handing out permits to anyone with cash. Certain countries were called out by name as being particularly egregious.
So while we take the whole “RBI/CBI is selling our citizenship to criminals” as hyperbole… like most things, there was something to it. It wasn’t all programs of course, or most applicants of course, but the bad apples always spoil the barrel. And of course while there were details and if you saw them it made more sense, stuff like this never bubbles up to the surface, all that makes it is news bites and hyperbole.
What has happened under the hood is that the processes around the programs have been cleaned up. Guidelines were issued by the EU saying " we wish you’d stop the programs entirely, but you need to do X Y Z at a bare minimum". That doesn’t mean the EU likes RBI/CBI, but it at least makes it tolerable.
The thing is, Portugal isn’t one of these countries. They have processes and procedures. We can’t necessarily extrapolate from our experiences in Portugal.
No, I don’t have references. I dug through a lot of memos and docs, but didn’t save any of it since I more or less blundered across it and was reading it for my own edification, and writing a whole report for the benefit of NG is well beyond the level of effort I’m willing to commit to. FWIW, it’s like anything else - there’s what you see as the high-line soundbites, but under the hood there is a lot of thought and work that goes into these topics, and a lot of memos from people and groups who are really trying to do the right thing.  It’s not hard to follow the chain if you dig through all the committee reports and the like - it’s all public, just like all other EU reports and memos, but easily lost in the big online filing cabinets.
Underlying it all is of course a general belief that European citizenship is for people who care about Europe, who are invested in Europe in a cultural sense and believe in the European project. Many people in the EU still believe this and thus really do object to CBI/RBI, and frankly I would agree with it even. But this of course is hard to adjudicate - what does it mean? And so you get divergent answers. Just as people’s situations are individual and complex. </shrug/>