Distracting!
I love Udemy! There are many courses that I want to enroll in and learn for certifications but so many of the narrators have such thick accents that it is absolutely unwatchable. I'm sure the training is amazing but if my hearing can't synchronize with the words your saying, I'm not going to learn anything.
I suggest that if you are a video instructor with a strong accent(you know who you are), please use AI or an automatic voiceover site to do the audio.