There aren't, if you exclude all the spam blogs, and include only the ones that are fully accessible without a paywall and have received an update in the last year.
A huge proportion have simply stopped updating, gone offline or moved to a paywall on substack/medium/etc...
The 50k number is all inclusive and probably even still an overestimate.
How did you derive that figure to begin with? And in what realm does only what's been posted in the last year qualify as information worth retaining the ability to retrieve?
It's an estimate based on my own experience? I'm not really sure what your specifically asking for.
And I never mentioned whether something 'qualify as information worth retaining the ability to retrieve'... are you confused about what the comment chain is about?
A huge proportion have simply stopped updating, gone offline or moved to a paywall on substack/medium/etc...
The 50k number is all inclusive and probably even still an overestimate.