[1] https://research.googleblog.com/2014/11/a-picture-is-worth-t...
[1] https://research.googleblog.com/2014/11/a-picture-is-worth-t...
[1] https://www.soasta.com/blog/page-bloat-average-web-page-2-mb...
Assuming 1 bookmark per day during 10 years, this will sum up around 8 Go. Storage is cheep enough nowadays so I can support these 8 Go over 10 years. This will probably not be mobile-friendly, but I'm almost never consulting bookmarks from my phone anyway.
Your project seems interesting, thanks for sharing! This may be especially useful to see how you implemented the readability part.
Crestify is a web application, so you could run it on a server and access it over a mobile app. Really happy to hear you like it. And I'm always open to new ideas about it :).