After attracting 2 million users in its first year of operation, Bluesky has grown another 400 percent with some recent help from Brazil and Elon Musk. Are these monthly or daily users, or just account holders? Nobody knows! But it still has a way to go to match X’s estimated 250 million daily users and Threads’ 175 million monthly users.
Even if your numbers are true. Mastodon has existed for 7 years. Bluesky for less than one.
So logically the precentage of users to active users should be much higher on Bluesky.
Also number of accounts is possibly a bad metric to judge mastodon because of the federation.
For example, I have 8 mastodon accounts (tried a couple different instances and programmed a couple rss bots to give me a news feed).