I agree with this comment:
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The founders just got bored with maintaining the site, or don't have time ...and desire to look for monetization other than simple ads. The problem is not about bills, abandoned date in footer (2006-2021) confirms it. Anyway, kudos. It's been a long journey.
I think it would be fair to give at least a month's notice, which is equal to their standard period of auto-deletion of the file.
I hope that on April 1 they will close the site and on April 2 they will reopen it. 😊