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It's a virtual network and operates on DTAC's network so the service is as good as dtac.
If they're not asking for password (which they will) thenl definitely they have some sort of back channel access to spy on everyone (which they do).
Otherwise they'll only be able to look at your public posts on social media and not private posts. On Facebook you can make all public stuff private in settings with 1 click.
No wonder they call China a spy. Distraction is all it is.