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Bluetooth and wifi mac spoofing is pretty common, both when scanning and connecting. Both iOS and android do it to certain degrees.

It does indeed boost privacy as wireless networks in public places have been trying to track phones this way for a while now.

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I don't know how it is now, but I remember a lot of generic/no-name Androids using the Mediatek platform would have random MAC addresses (which change every time you re-enable WiFi) because the manufacturer didn't bother writing a fixed one, so the firmware automatically generates a random one to use.

My Pixel 4 uses a different mac every time it connects to a wifi network by default. You can disable it per-network.

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