The money from the fountain gets collected and sent to Caritas, a catholic charity that focuses on health, disaster relief, poverty, and migration. I am a Queer atheist person in Spain that uses their services and they haven’t once made my queerness an issue. Nor have they exposed me to their religious views.
So, shrug, I’m not gonna shit on them doing the tradition that many diplomatic events in Rome do.
Pretty sure the closest was Hitler.