I can't think of any reason for spoofing IP addresses that would need to be offered by a shared host.
You can only spoof outgoing IP traffic anyway, so proper client/server communication couldn't take place.
IP spoofing is often used in DDoS attacks, so a single source can evade IP blocking at firewalls, so in that way it does cause problems for hosts.
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We have a possibility to provide spoofing for our long term and trusted clients, if they need it for legitimate purposes. All others should prove their intents are not malicious. Well...everybody chooses themselves.
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