For the last 8 days I’m seeing ≈420K total inscriptions written to blocks. The total number of 2.5M from Glassnode as of the 5th is probably right, I don’t have data for January, February, or March yet so I can’t compare my numbers to Glassnode’s, but I assume they are probably correct.
But I don’t have any clue where “Dune” got their numbers from. That smells like bullshit unless they are counting pending transactions or all transfers or something else.