Let's not forget about derivatives. The biggest use case for Bitcoin, like it or not, is speculation and I dare wager the majority of people who have ever placed a brt or traded Bitcoin never actually interacted with it, much less owned it.
Price simply doesn't matter with adoption. Merchants and users don't necessarily need to own it, merely use it as a medium pre fiat settlement. And speculators don't care how many units of BTC they have when they invest in dollars.
Platforms don't care either. PayPal can sell 1000s of BTC, it's all numbers on their account. No real coins behind them. Still counts as adoption. Or exposure. Not by me, but by practical measures.