Is blacklisting broken?

I've created /etc/modprobe.d/wireless.conf with one line:
  blacklist r8712u
and yet, after a reboot, the r8712u module is installed.

Why?

It isn't being used; if I run   rmmod -vv r8712u   it is removed
and nothing else changes.  The wireless USB adapter still works,
because it is using a new r92su module.

The wireless adapter is a Rosewill;  lsusb identifies it as:
  Bus 002 Device 002: ID 0bda:8172 Realtek Semiconductor Corp. RTL8191SU
  802.11n WLAN Adapter
It has worked with the r8712u module for a long time, but recently
became intermitant and yesterday stopped altogether.  It still works
fine with Fedora 24; but fails with kernel-4.10.12-200.fc25.x86_64.

So I fetched an experimental developmental new r92su module from
  git clone https://github.com/chunkeey/rtl8192su.git
After building and installing, the r92su module works perfectly.

I've solved the main problem, but am left with the blacklist
mystery.  Apparently "blacklist r8712u" does prevent r8712u from being
used, but not from being installed.

Is that not weird?

--
        David A. De Graaf    DATIX, Inc.    Hendersonville, NC
        d...@datix.us         www.datix.us
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