A server provider usually operates in several countries, so unless someone is cutting an underwater internet cable, a witness can reactivate their server within 24 hours (much less if he/she is more experienced).
While a server in their home/office can easily be shut down for 3+ days, if their ISP is shitty in their area.
If there was an infrustrcture to allow witnesses to share their servers with each other (if that's even possible), to could allow more decentralisation without the drawbacks I meantioned. But I don't know how feasible such a project is.
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I’m not suggesting no redundancy. A witness should obviously have their backup server node in another location with another internet provider. Also it’s easy to have have a backup internet provider at your home or office. Everything an outsourced provider can do can be done for much less cost yourself when you are talking about single digit number of servers, which is what decentralized solutions involve.
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