Much as I'd rather not discuss Worm on a DC thread, I need to correct a couple misconceptions.
That didn't happen because Scion-tinkertech isn't mass-producible.
This isn't true.
Muramasa as far as we know is a Scion trigger, for example.
And the fact that WoG states that Eagleton is a quarantined city because of the Machine Army suggests someone else cracked mass production too, even without.
By WOG it is pretty much what would have happened if Eden hadn't been killed, both to Africa and the world. Much of her tinkertech is designed to be mass producible
Neither is this.
Eden could tweak triggers, but it's a function of the restrictions she puts on the shard, not some fundamental difference between her technologies and Scion's.
Eden and Scion were a mated pair after all; they have the same base technologies available.
Also, Africa dissolved into chaos as bad as it did because it's already such a unpleasant, high-stress place, which created more parahumans faster. The way triggers work and the way shards push for conflict pretty much ensures a feedback loop of worse conditions leading to more parahumans leading to even worse conditions and even more parahumans, etc.
This is an exaggeration.
Large parts of Worm!Africa are in chaos; Africa is a freaking big place, after all, and places like Southern Africa in the 80s and early 90s were powder kegs waiting to explode(thanks apartheid).
But we never get a look at West, Central or East Africa, and have no way of determining how they were doing.
We don't even get any comment on North Africa, besides Ash Beast originating somewhere in Egypt.
The only African country we see briefly is Cape Verde, and it was run well enough to have mechanized military formations available for Khonsu to attack, something that Japan apparently didn't.
So yeah, calling Worm!Africa chaos really tends to be overdone.