Quranic verses are sacred entity for Muslim community. We hold Quran with great respect. Listening or reciting Quranic verses is a kind of ibadah. Just like you cannot indulge in vain activities while saying your prayers same way you cannot talk or involve in vain activity while reciting Quran. 
it is therefore considered a sin playing ads in between recitation of Quran. Besides it causes great disturbance to the patients who listen to it for spiritual healing. 
I request all Muslims to sign this petition because YouTube is hurting the sentiments of Muslims by showing ads in between the recitation of Quran which is our religious scripture.