Nope it’s just a regular email provider with IMAP support. I just send myself an email with the link and optionally some cut and paste content or notes. I have offline backups of all my IMAP accounts also. I find it convenient because I just add that account to whatever mobile or desktop environment and then can use search functionality of email client. It’s a bit silly but it’s worked out ok for me for many years now and yes definitely works for 10k emails of bookmarks, no problem.