Unfortunately, even if the BOM costs them maybe £100 at volume for a chunky FPGA and some sensors and signal parts - much more for something specialized like an rfsoc board (like easily enough to buy a house), they're intended to be bought with people's bosses money so they're not really within budget for a hobbyist. That's also partly why the documentation can be quite poor - the bargain chips (think Chinese companies with funny names on LCSC and taobao) kind of assume you'll either reverse engineer it as a team, someone speaks chinese, or you'll ring them up and ask for support. The more mainstream parts in higher margin products have much better documentation, i.e. the big American silicon companies will usually document how their chips are programmed in depth rather than some obscure-ish Chinese parts I've seen where you either work it out yourself or use their slightly wonky freertos fork.
What kind of sensors do you have in mind? Phones do have sensors but the software isn't really optimized for high speed data acquisition (I think using camera interfaces is a hack used in industry for getting data into high level embedded systems)