You can always use your personal phone as a hotspot. If they allow hotel wifi they are not blocking your personal hotspot.
I suppose u/firegore may have meant technology-wise in the sense of “wrap it in TLS and send it”.
I have EMS actually to manage FC. So the step to ztna should be doable. But without EMS, the business case is different.
If it’s an employee using their personal cell to hotspot, that would be considered using a personal device for work, which is often limited or not allowed at large corporations with BYOD policies.
Personal hostspot is way better than free open wifi.