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I’ve been privy to how a few of these highly regulated organisations are handling WFH, and the main challenges they seem to face are compute/network capacity on their virtual desktop/VPN/conferencing/instant messaging infrastructure. Which usually tend to be hosted on site. Of course people could bypass the systems completely, by say getting a private slack for their team. But doing so would (usually) be a policy violation, and from a compliance perspective, policy is often a valid control. Not all regulations require technical controls, and if they do, there’s often room to make exceptions to implement alternative controls when circumstances require it.

if the intent is to bypass monitoring someone can use their phone

Not if phones are checked in at the security desk when you arrive, there is a phone jammer operating in the building, and compliance staff are patrolling to make sure no one has smuggled a phone in. These measures are normal on most trading floors.

This is why personal phones are generally not allowed on trading floors.

No kidding! Ok, that makes more sense then.