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I don't think that this is a conspiracy by phone manufacturers to force purchases of phone hardware.
All kinds of devices use fixed batteries these days, not just smartphones. It's cheaper, lighter, makes the device stronger, avoids them having to deal with "User X bought a counterfeit battery that then caught fire" -- that's a real issue for lithium batteries, unlike traditional alkaline/NiMH-type removeable batteries. Virtually the only device class I can think of where removable lithium batteries are the norm is high-end flashlights -- anything on !flashlight@lemmy.world probably supports removable 18650s or similar. I have gone out of my way to get a lot of devices that use AA batteries or maybe 18650s, but there are just tons of products, including in highly-competitive, low-barrier-to-entry industries like gamepads, where it'd be impossible to form a cartel to refuse to offer a device with removable batteries. And yet they've mostly moved to fixed batteries. There is no industry convention for removable, BMS-enabled, lithium batteries the way AA or the like were traditionally used in devices.
If there were a cartel driving this against consumer wishes as a whole, you would have just smartphones doing the fixed battery thing, not the consumer electronics industry as a whole.
If it were cartel-driven, I'd also expect to see, in a situation like that, manufacturers making hefty use of price discrimination -- like, think of how some laptop vendors charge a premium for devices with a lot of RAM when they have soldered RAM. But in the market today, the differences in battery size are minimal. Google makes a "large" version of the Pixel, and they barely bump the battery up, even with a slightly larger screen.
Instead, it was associated with the shift across consumer electronics to non-removable batteries with the move to lithium batteries, which is what you'd expect if sketchy batteries were a problem.
Phones in particular have a space and weight premium, so compared to a lot of devices that aren't held in your hand, using removable NiMH batteries or the like is more of an issue.