It’s paraphilia. Specifically, paraphilic infantilism.

There is a documentary on it. I can’t even describe how creepy it is.

I just did a cleanup on someone’s computer that got this. They actually called the number and got scammed out of their whole life savings. The usual Indian scammers.

Multi-account containers?

I use WebDAV because my phones use that for all services which keeps everything on my own servers. Contacts, calendar, files, etc. Both Android and iPhone can be set up this way.