Most unlimited plans are outlined in the AUP/TOS. Further so long as you are not impacting other customers in the shared hosting, it is not generally an issue.
On the contrary, the TOS limitations are often an issue. They often regulate what you can use the data or hosting for. For instance, unlimited hosting plans often prohibit running download sites or being used as backup storage for yourself, to avoid you from using a lot of space or a lot of bandwidth. They also usually prohibit you from running cron jobs or game servers or chat bots which can be higher on other server resources.
"Unlimited" hosting plans are effectively geared for basic personal or small business websites only. And if you go over some soft limits they're almost certainly monitoring, they'll find an excuse in the TOS to disable your account.
"Unlimited" hosting plans are effectively geared for basic personal or small business websites only. And if you go over some soft limits they're almost certainly monitoring, they'll find an excuse in the TOS to disable your account.