Zoom Video Communications Inc will let paying customers decide which countries their virtual meetings get routed through, a move to assuage clients worried they may be vulnerable to possible Chinese snooping.

The ability to select preferred datacentre locations will be available beginning April 18, Brendan Ittelson, Zoom chief technology officer, said Monday in a blog post. Paid users can also opt out of certain locations. Free users will be locked into datacentres in their region, which will mean a US-based datacentre for many users.

Zoom has gone from being used by 10 million office workers a day to more than 200 million people, including many consumers. The new uses have exposed security flaws with the app’s default privacy settings, thrusting the company into controversy and spurring chief executive officer Eric Yuan to focus on the safety concerns.

Researchers from the University of Toronto found that some Zoom calls had been routed through data centers in China despite none of the users being based in the country, raising the specter that the data might be accessible to the Chinese government. The company said it would stop routing calls through China unless one of the participants was based there.

Zoom has 19 datacentres, which are shared with other tenants, and also uses cloud-computing services from Amazon.com Inc and Oracle Corp.

 - Bloomberg