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Intel segments ECC support by Chipset and only the Workstation chipsets get ECC support. I recall reading somewhere that Intel was also ceasing the support of i3s and server chipset support and the Intel Ark page supports this: https://ark.intel.com/products/126688/Intel-Core-i3-8100-Pro...

No, that remains a Xeon feature.

And on low end i3 chips

Yes, an example from 2017:

https://ark.intel.com/products/97455/Intel-Core-i3-7100-Proc...

The latest i5 or i7 with ECC were introduced in 2014.

Now, does anybody know why i3 but not i5 or i7?

Probably because there are no i3 equivalents in the Xeon line (no dual core Xeons) and Intel wants a low-end ECC supporting CPU.

Keep in mind that for at least the last couple generations, even though Celerons, Pentiums, and i3s support ECC you must use a server chipset like the C23x or C22x to actually get ECC on those CPUs.

No FPGA onboard either.