Google Meet or any meet app like zoom etc is constant connection to internet, Video and Audio Downloading And Uploading at lowest latency possible, it is close to the most demanding thing you can do on any phone, right up there with playing a heavy game or recording 4K video, any phone will heat up after a while as they don't have any cooling fans, some top tier flagship devices can hold on to the sustained load but will heat up as well, the heat is normal you are using the device for an extended period and constantly pushing 5w-10w of power from the SoC.
The ideal thing of Meet/zoom etc is a laptop or a cheap tablet, they have bigger batteries and more surface area so better cooling, will last longer. Phones will work but at the cost of overheating, and doing that every day for months/years will lessen the battery lifespan of the phone due to heat and wear and tear of the battery.