DPI is a sham, most of those specialized HW (sold by pseudo IT security gurus) just assume that any VPN connection "is bad" and procced to block them, there is

DPI is a sham, most of those specialized HW (sold by pseudo IT security gurus) just assume that any VPN connection "is bad" and procced to block them, there is no way to detect a pattern on a (decently-configured) VPN, there is a reason China (the biggest investor on that this type of tech) is mandating Apple and Google to delete all the VPN apps on their stores.