The connection may be good enough to surf, but if a company says you must have Ethernet to work in their call center, they will be monitoring latency loss and jitter and wifi will be noticed, even if it’s some kind of tether / travel router.

Ethernet is a hard requirement for most remote call center jobs, and they will use network analysis to make sure your connection is within specific latency and jitter requirements and fire you if your internet Isn’t good enough.