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We see a lot of efforts to convince suckers of absurdities in the US because there's a lot of economic value in swinging American votes.
In other countries that either don't have voting, or don't have a lot of economic power, there's less to be gained by befuddling morons.
There is a hidden assumption in your comment: conspiracy theories are intentionally created or reinforced with specific strategic goals.
My conspiracy is that conspiracies are a conspiracy
While I think that it's probably rare, there have been conspiracy theories that are intentionally crafted to achieve goals.
https://en.wikipedia.org/wiki/Operation_INFEKTION
And I am very sure that there have been many efforts to amplify existing conspiracies; you can look at disinformation research.
I think that the majority of conspiracy theories are asroturfed, even those that actually started as grass roots. The Russians clearly admit that reinforcing propaganda rhat sticks, is a big part of their strategy.