Why does Platco PR1 appear on iPhone Bluetooth under 'other devices'?

That’s some other Bluetooth device in proximity.

An organization known as Universal Electronics reportedly uses that name, and they provide all sorts of gear including entertainment controls, sensing devices, climate control, and other products.

Get the (free) app LightBlue, and see if that can help you localize this particular Bluetooth source, based on relative signal strength.

That Bluetooth identifier looks like electronic communications components that can be used within various other gear.

You’ll need to watch relative signal strengths, though Bluetooth gear that is nearby in a transient basis or within other nearby residencies or businesses can be (is) entirely normal.

Cryptocurrencies are somewhere between exceedingly speculative, and a vehicle for scams, fraud, and money laundering, and are unrelated to Bluetooth hardware. Some cryptocurrency hardware wallet might (and probably also unwisely) have always-active Bluetooth, though.

Finding unexpected Bluetooth cameras aimed at areas within your home would be somewhere between fodder for discussions, and fodder for legal or police discussions, particularly with whoever installed those.

Universal insurance and universal electronics are not the same company or brand.

im also having platco-PR1 showing up on my Bluetooth devices and trying to figure out what it is.