“Product owners will be misled. Such activities are a threat to the overall economy,” Sa Kaew immigration chief Pol Colonel Benjapon Rodsawas said on Monday.

He made the remarks after three Chinese men were arrested in Sa Kaew province on Sunday.

The three suspects confessed that they earned Bt100,000 for using the WeChat app to generate Internet traffic that could have misled vendors of Chinese products, he said. Available evidence suggested the men targeted Chinese advertisements only, and Thai brands were unaffected.

“Their employers, ad agencies, received payments based on the number of ‘likes’ and views,” Benjapon said.

The three suspects were identified as Wang Dong, 33, Niu Bang, 25, and Ni Wenjin, 32, all of whom were charged with working without a permit and possessing smuggled phones. Officials planned to bring them to court on Tuesday to ask for permission to detain them further.

No one has visited the suspects during their detention and police said they were showing signs of stress after their detention.

Authorities said the suspects had not named their employer but said they had been supplied with 474 cell phones and 347,200 SIM cards for their operations.

“We will investigate further how they could acquire such a huge number of SIM cards, which require registration,” Benjapon said.