One of 2 things: a glitch due an update, or a measure against misuse.
I had a few experiences with glitches when my kid was in BS. A fun one was where parents were assigned user names, but the the system would only allow us to login with our email address. Another was when suddenly I couldn’t toggle between the alumni directory and the parent directory. And somehow I now have 2 entries in the alumni directory.
As for misuse… In 4 years of BS the ONLY time another parent used information from the directory to contact me was when there was some faction of parents that had copied EVERY PARENT’S email address into a google group and tried to undermine the administration during COVID restrictions. And I really <3 directories and playing with their information. But, even when I was on a fundraising committee, I was more likely to use my kid’s class roster than the directory. (I’ve heard that it helps to personalize an ask.)