Is tethering/hotspot dangerous for your Android phone? Is using your Android phone as a portable hotspot/tethering dangerous for your hardware part? 

In our dormitory we do not have good internet connection and I'm forced to use my phone as an internet spot 24/7 (we basically can't even search a thing on Google)

How dangerous this can be? I am not talking from a security point of view, but rather from an hardware point of view (short-circuit, not being able to use Wi-Fi in the future etc)

I am aware that keeping my phone connected 24/7 to my laptop will drain battery's life
There isn't enough/real evidence suggesting that tethering is harmful to device hardware. AFAICT this is a feature-by-design that any android device (supporting tethering) should be able to handle without detrimental effects other hardware except perhaps that the battery may be degraded a little bit due to overheating.

(Just like using your PC to play high graphics games 24/7 with a gaming PC, even though the PC seems to be "overworking", you'd agree with me that's what its designed for. Isn't it?)