The first drawback is resources...Habeas would have a fairly heavy-duty server to generate and validate the signatures..
CPU time might be cheap on a single-user machine, but when you're talking about global scales, a little bit of extra cpu time per message adds up to a LOT of cpu time.
A modest server can do kerberos for a university campus, however try to scale that from 50,000 people to 50 million or so. You're talking a factor of 1000 in terms of increased load.
Let's be generous and assume you can get 10-fold the performance by making it a "high end" quad processor system instead of a "modest" system. You still need 100 of them to take care of the factor of 1,000 load increase.. not to mention some added equipment to load-balance all those machines.
So you need 100 quad-cpu high-end systems, and some added load-balancing hardware.. assuming about $5,000 for the quad CPU boxes, and about $30k for the load balancer you're talking a hardware budget of $530,000. Add costs for facilities, racks to mount it in, power conditioning, etc and you're probably looking at a project costing about $750,000 on the low-end, and could easily go up to a couple million.
Sure habeas could cause the service to be less heavily used and recoup some of their cost by charging you $0.50 every time you generated a warrant mark, but that'd make the service unpopular and it would collapse. Nobody want's to pay per-message to prove they're not a crook.
It make be naive (note the e) to assume that habeas can find and sue everyone that abuses their mark, but it's also naive to assume that CPU time is free or cheap when serving a global market.
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