Im not yet sure on this, not sure if anyone else is ether but we offer "unlimited" database's/email accounts, subdomains and the likes as do almost everyone else although the only restriction on this is the size of your package a.k.a if you had say 1gb diskspace you couldent have two email accounts with 2gb inbox's each..
i dont in anyway agree with the terms unlimited or unmetered in bandwidth or diskspace as this is overselling however i am yet undercided for subdomains, databases and email for example as these all have the physical limitations of the package the customer agrees to.
for disk limit i agree, but for bandwidth - it may be set as "unmetered" and it is NOT a lie to no one, dont forget, there are 2 kind of limits -
Logical - depends on if your host will set a limit on his control panel for your account.
Physical - depends on the uplink duplex speed of the
server / datacenter / ISP loads
I always say, give your clients AS MUCH AS YOU CAN! , just do the right math when you put the numbers in.
For a 1Gbps server or a 100Mbps server the math is not the same.
keep that in mind!
so its limited , not metered!