"They attack major figures to intimidate the others and promote self-censorship." said Khadja Ryadi, the head of a group backing Anouzla.
Morocco, a popular tourist destination, is generally considered more stable and open than its North African neighbors, but it still ranks low on press freedom indexes.
Starting in 2009, a number of publications known for their independent stances were shut down by the government or forced out of business. Most of the print and broadcast media now strictly follow official red lines avoiding criticism of the king, the country's policies in the Western Sahara and Islam.
So many of the independent-minded journalists have gone online instead.
This year alone, Anouzla's site broke the story of the king's accidental pardon of a convicted Spanish child molester, warned about a post-Arab Spring crackdown in the country and criticized the king's frequent trips to France.
"The independent press has left for the internet," Ryadi said. "So now the repression has moved to the internet."
Morocco's government has promised to reform the penal code so journalists don't face jail time for their writings. Amnesty International, which has been closely following the case, said Anouzla's prosecution does not bode well for those promised reforms.
"This case is a very worrying signal for us," Amnesty researcher Sirine Rached said.
___
Smail Bellaoualli in Rabat, Morocco, contributed to this report.