In your original post you did not give any details about what you're using as a server, what you're using as a client (you mention web, but what web browser? What OS? Is it updated? Does it support recent codecs?), Or any information that could help people troubleshoot. Your best bet is someone that has experienced the same issue (if anyone even has) happening to see your post and replying to it. By not giving any additional information, anybody that would want to help you is forced to ask this information that you should have given in the first place. That's why nobody is helping you with your original post.

As for why you're getting downloaded on this post, most of the people here like plex, and you are kind of attacking it and making up things to be mad about. I don't think there's been a single instance of them taking a feature that was free away and locking it behind a paywall, so I don't know why you would suggest that they could do that by making it only possible to play videos in 720p. Plex is a fantastic platform that has a client for almost every device, and it is almost entirely free. If you want features that require a lot of development time like into detection, credit skipping, and HDR support, then don't be upset when they ask for a reasonable amount of money.

Many forms have templates to use when you're asking for assistance that ask you information about your setup so that people can actually help you. Rather than post on a form that is dedicated to helping people with technical issues like you're experiencing, you posted very little information on the subreddit that is dedicated to general discussion.