I'm sure they have monitoring services to detect banned IPs and rotate on new IPs. However, in my experience, the most popular VPN providers are actually not specialized in evading GFW despite what they claim. During sensitive periods of time, most of the them couldn't be connected reliably. Those providers specializing in providing GFW evasion are called 'airports' or 'ladders' in the Chinese community and they use custom non-VPN protocols and tools for their services.
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