In fact they already do this. Buying 100 android phones and chargers is cheaper than reverse engineering whatever you're trying to automate - or was, before AI.
I literally work on this. The problem is that enforcing device attestation impacts DAU so platforms don’t want to do it but it’s effective. Once the internet is unusable, device attestation will be required to access services. Ad driven businesses will start to see demand from ad buyers for non-bot traffic etc.
