Update 2: We added back Windows 32-bit wheels in today’s Pillow 10.2 release.
While we only had one report of someone needing to use 32-bit Python (a win32 COM library could only be imported using 32-bit Python on legacy systems), we had quite a few more from people who installed 32-bit Python on 64-bit Windows and didn’t really have a reason for it.
I suspect it’s because 32-bit Python is listed first on pages like python.org/downloads/windows and python.org/downloads/release/python-3121, so they just click the first one (see python/pythondotorg#2194).
(We also switched to cibuildwheel for today’s release, so it was easy enough to re-add support.)