I didn't expect so many people to hate Zhang Xuefeng, and they're celebrating his death.

I also didn't expect him to have so many followers, saying he deserves to be honored in the ancestral temple?
He was indeed highly controversial.
What Zhang Xuefeng did was simply make information that was previously controlled by a tiny minority publicly available online, and package it into freely tradable commercial services.
This is business—there's nothing inherently socially harmful about it.
But you can't glorify him under the guise of being a "selfless teacher,"
because the market he serves is zero-sum.
He helped certain ordinary families outcompete other ordinary families, because the total number of college admissions slots remains fixed. Wealthy people don't need his services, and impoverished families can't afford them, so ordinary families who can afford to consult him got ahead of those who couldn't.
In just a few years, three companies reached billion-dollar valuations, with one about to go public, and his personal brand became the absolute top player in the industry.
So don't treat him like a teacher—he's a businessman.
A businessman should only be judged by commercial achievements, and on that front he was extremely successful.