Earlier quoted context omitted.
It's not a nefarious plan to stop me from doing what I want in a FOSS browser on a PC where I can compile and run what I want. It will be used that way, however, on locked-down devices users pay for but don't actually own.
Then don't buy such a device which clearly doesn't meet your needs. Why should every personal computing device on the planet be tailored to your requirements, at the cost of safety for the majority of other users? Most people don't use PiHole, they use Adblock or uBlock which are not affected by this. It's not as though they are taking away your ability to use adblocking technology.
Because by making this the default, they are helping centralize the internet and greatly benefiting the entrenched powers while putting barriers to entry for the rest of us.