Meet isn't much integrated into Chrome, so absent a Chrome bug, closing Meet stops running Meet code, so stops the meeting. “Closing” Zoom relies on Zoom detecting the closure and stopping the meeting.

It's not about spying from the software authors (having these softwares on your computer makes that impossible to defend against), but about knowing whether the people you were just talking to still have access to your camera and microphone feeds.

> Meet isn't much integrated into Chrome

Again, how would you know that? There is no reasonable way you could possibly know that.