I’m using a similar format to keep my links organized on an iPhone. A bookmarks.txt note kept in Apple Notes with markdown # headings to separate each category, allowing me to not keep open 500 tabs on Safari.

Why not just use actual bookmarks in Safari?

Let me check... 1331 open tabs in Safari on my iPad. Several text files with thousands of bookmarks, with various attempts at grouping. Since I cannot save myself, I save them.