Simply "buying sats". Let's assume you've just learned what a Sat is 5 minutes ago, now you've decided you need to get 5,000 of these so-called Sats because that'll unlock something fun on Nostr (which you've also just learned about a few minutes ago). Your motivation will carry you for about 5 minutes of Googling, that's about it.

Strike debit card purchase works in 30+ countries (not in Canada and some other larger ones), and not in some US states like New York. Where Strike does work (and I've just onboarded to test) you're looking at photo-scanning your passport, scanning your bank statement or utility bill, scanning your face, waiting a day, getting an ask for another scan of a bank statement, scanning that one too, waiting 2 more days, then getting approved. Then you must buy minimum $25 worth of Sats, then after that you must figure out how to send these to your Nostr app, and of course understand the underlying plumbing of it all to at least some extent so you don't fear you'll do something wrong. (The Strike UX is not easy for newcomers.) Nobody looking to grab a few Sats on a whim is going to go through that.

Or you could go the Primal route, but 30% goes straight to Apple. If you're thinking about the person providing the experiences (say a creator) it makes no sense to use Primal over say Patreon. On Patreon it's 8% and they just use their card. Primal it's 30% to Apple and the drop-off from having to still KYC and buy Sats, there's no creator business model there.

USDT is of course far easier, and maybe USDT Taproot integration will help depending how swaps develop. But at the moment simply "getting a hold of Sats" is a massive barrier for most people.