Faculty members are busy. One of the many reasons for that is a constant flood of emails. For example, I receive an email message (on my university email account; I'm not counting personal stuff here) on average every 19 minutes and 5 seconds. I imagine that there are people with much busier inboxes than mine.
In such situations, time constraints require faculty members to keep sent emails to a minimum. After all, I cannot spend all my time on emails; I have educational tasks to fulfil, and I would like to occasionally do some research too. So when I receive a PDF of someone's thesis in the mail, I will file it in the right folder, maybe print the thesis, and move on to the next topic. I will definitely not write an extra email acknowledging receipt, because that half minute can be spent on checking off another task or two.
I appreciate that this might strike students as impolite. The one thing I can offer you is that it is exceedingly unlikely that this is a personal thing. It's not that the reviewers don't like you, or that they don't want to acknowledge your existence; it's merely a lack of time on their side.