YouTube views are easy to fake. From my observation of the "trending" section it seems that some music producers have figured out how to game the algorithms.
The "trending" section is for paid promotions. No one expects it to reflect view counts at this point. The issue of fake views is separate and probably difficult to do at that scale without being detected. Getting a few thousand fake views past the algorithm is probably easy. Getting 10s of millions is probably close to impossible.