There are many ways to promote a practice, in this case we are talking about DS practice without having to necessarily cause the suffering and confusion in some people's mind. You can even engage a good PR people to discuss the strategy of promoting a deity. It does not have to be the ban. A good example is Jesus Christ, Buddha Shakyamuni, etc. have been famous for many centuries. I do not think that they celebrity status is attributed to any ban or religious persecution that may have been executed by others in their name.
On the contrary persecutions based on belief defined the Christian religion and Christianity is one of the clearest examples of how persecutions on its members brought about its growth.
The persecutions of Christians started with the crucifixion of Jesus on the cross and continued after his death. Jesus was put to death on the cross for no other reason than his belief. He committed no crime against man or state. After his death his followers were hunted down.
Here is a good account of the persecutions:
One year after the crucifixion of Jesus, Stephen was thrown out of Jerusalem and stoned to death. Approximately 2,000 Christians suffered martyrdom in Jerusalem during this period. About 10 years later, James, the elder brother of John, was killed when Herod Agrippa arrived as governor of Judea. Agrippa detested the Christian sect of Jews, and many early disciples were martyred under his rule, including Timon and Parmenas.
Around 54 A.D., Philip, a disciple from Bethsaida, in Galilee, was scourged, thrown into prison, and afterwards crucified. About six years later, Matthew, the tax collector from Nazareth suffered martyrdom by the sword.
James, the brother of Jesus, was beaten and stoned, and finally had his brains bashed out with a club. Matthias was stoned at Jerusalem and then beheaded.
Andrew was the brother of Peter was crucified on a cross, the two ends of which were fixed transversely in the ground (this is where we get the term, St. Andrew's Cross). Mark was dragged to pieces by the people of Alexandria in front of Serapis, their pagan idol.
It appears Peter was crucified upside down and the apostle Paul suffered in the first persecution under Nero.
And the list goes on. And yet as the persecutions were at its most furious, the faith in Jesus grew into an organized religion.
Mass persecution of Christians only stopped after Emperor Constantine of Rome became a Christian himself.
Buddhists on the other hand were not persecuted in India where Buddhism started and the religion largely disappeared from the country of its origin.
Before the invasion of Tibet by China, the religion saw only very moderate growth and only when Tibetan Buddhists were persecuted by the invading Chinese that the religion exploded into the world.
For whatever the reasons are, religious persecutions become the primary factor that drives spiritual breakthroughs.