> My private collection won't ever compete with Netflix, Google or the like

You are not allowed to do that!

The reality is that with minimal effort and money you can cheaply buy some multi TB drives. Get a 100 euro computer, a 50ish internet connection, a torrent feed and a usenet sub. Netflix has very little stuff by comparison.

You can also set up a crawler with some archiving and crawl that part of the internet that is interesting to you specifically. Feed it the urls you've visited, crawl 1-3 links deep from there and you will be in awe how fantastic the search results are. If you type "banana" in the search box it will give you a surreal page full of interesting pages about bananas. (Interesting to you only)

As the collection grows and time expires you will also be increasingly shocked how many of those website are not around anymore.

I ran a dead link checker on 10k old bookmarks for a niche topic one time. I didn't pay much attention to the topic for 8 years or so. I was very excited thinking I would find all kinds of new developments. In stead it was depressing as f. Something like 50 links worked. Stuff like a link to a Google search result.