to add one that hasn't been mentioned in this thread, a good hostfile can both block ads and speed up your internet.
https://github.com/StevenBlack/hosts
The number of times I had to yell at family members to NOT CLICK THAT ITS AN AD is maddening. It required getting a pretty nasty virus and a complete wipe to actually convince my dad to install adblock.
It's complicated, because some of our best examples of recently successfully developing economies (Japan, Korea, China) actually had pretty heavy state intervention and tariffs to protect growing industries.
Bug report: the balance wheel animation when run on Firefox on my android eventually becomes a forced oscillator, with the slider running off to infinity