Stealing from the yeshiva

Peace and blessings.
I have three questions:
1- One-time – The yeshiva director, who is the financial owner of the yeshiva, forbade bringing a chadaf into the rooms. Is there room to give an opinion on his words that, as long as it is not used excessively and inconsiderately, it is permissible. After all, it is clear that for the needs of a sick boy it is permissible to bring him into the room, and that his intention was not to prohibit it in the first place?
2- Charging a cell phone – The Rosh Yeshivah forbade charging any type of cell phone in the yeshivah. He later added that anyone who uses their cell phone discreetly in dormitories, etc., is allowed to charge it. The question is – is it permissible to charge a portable charger and use it to charge the cell phone? An argument was raised that there is certainly no reason to prohibit charging a portable charger (since, of course, just as it is permissible to charge Bluetooth headphones, it is permissible to charge a portable charger for the purpose of charging the headphones) and from there I already own the battery and use mine?
3- Portable air conditioner – the yeshiva (the owner-financial director) forbade using it. There is still a guy in our room who unfortunately was not informed that after the 2 commandments from God there was a continuation of the story, and stealing was forbidden.
The question is, am I allowed to enjoy his theft? And if so, when he leaves the room and does not turn off the air conditioner, am I obligated to turn it off (returning a loss to the yeshiva – saving the thief from stealing)?
I feel obliged to emphasize my appreciation for the Rabbi's investment in her. This is extremely unusual and not taken for granted at all.
thanks!