I don't understand why anyone would use passwordless disk encryption. It just seems inherently vulnerable, especially with the threat model of physical compromise.
Entering a password on boot isn't even that much work
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Entering a password on boot is a lot of work, because I need to vpn in, and run a java webstart kvm application (serial over ipmi would work better, but it doesn't work well on the hardware I have).
Encrypted disks is a requirement because I don't trust the facility to wipe disks properly. But I assume I would be able to clear the TPM (if present) when I return the machine. And I could store a recovery key somewhere I think is safe in case of hardware issues (although, last time I had hardware issues, I simply restored from backup to new to me disks)
Couldn't you wipe the disks yourself?
Or are you thinking of cases where the disk breaks, gets replaced, and the removed disk does not get properly destroyed?
Ex: the first server I had failed and they ended up replacing it with a different server with similar specs, but the drives werem't moved. In this case, the failure was gradual (resetting by itself) and as part of debugging it, I wiped the drives and installed a new OS, but towards the end, the amount of time between resets was very short, and I wouldn't have had a chance to wipe it if I had started later.
Yes, this isn't great service, but it's personal hosting and it's cheap and I get a whole (very old) machine.