I think that the airdrop who spent this wallet together with the Stellar company gave such results. This is probably the most reliable way to store Bitcoins.
With the years of their operation, I guess they already have millions of users and that airdrop of Stellar did gained more users for the said reward of $25 worth of XLM. With regards to that, the stats shows on how massive the adoption is.
There can be someone that has another one blockchain.com wallets but that's 35 million and that number is too high. I remember last 2017, Coinbase did a report also on how many users they get monthly and it's a whopping 1 Million users per months added to their database.