HN users are usually a very poor demographic to optimize for. It's a small demographic, for starters, and it's a very sensitive one (as evidenced by your comment). On the other hand my girlfriend, parents and probably all friends not working in tech wouldn't even notice it (where notice means "perceptibly annoying enough to have an explicit thought about it").
A lot of people honestly just don't care if the website is bloated or has numerous prompts to subscribe or chat. The users of this site evidently put up with it because it provides them with enough utility that they're not going to nitpick. The creators of the site have likely researched the market and business model enough to know that this is close to the ideal for maximizing profit without sacrificing utility. The website has hit market equilibrium.