Tamron Adds to their RF Lineup With the 17-70mm f/2.8 Di III-A VC RXD for APS-C

They're "selling" because they're bundled in. Crop shooters historically don't buy much beyond whatever their cameras come with.
Obviously. But your claim was that there is no business case for such lenses. If you meant no business case for OEM crop lenses other than those bundled in kits, you could have said that.

There is clearly a business case for APS-C kit lenses. As for the additional lenses, there aren't many anyway. For RF-S, the 18-45, 55-210 and 18-150 are kit lenses. The 10-18, 14-30 PZ and 3.9mm dual fisheye are the others, and the last of those is a very niche lens. That's consistent with the overall idea that there's not much of a business case for a wide selection of OEM crop lenses, but I highly doubt that Canon would design and sell a lens for which there was no business case.

They've been doing this whole camera- and lens-selling thing for a while, and they're pretty good at it.
 
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