Vlad
I didn't actually know Bitcoin was already accepted, so that is a good step. But the crypto market is simply a different market than the fiat market and needs to be actively promoted to in order to get meaningful sales.
For example I pay using my actual credit card for my subscription with Kagi and I use it for most things, particularly my work. But I pay with Nano on NanoGPT and I use that when I want to be extra sure of privacy. I also know NanoGPT get paid significantly more by card than by crypto as well, but crypto for them does at least make a good chunk. But that's because they promote to those communities directly. I only found out about them from Reddit.
I'd be willing to bet if a Kagi rep just went into a few crypto subs on Reddit and posted "Hey, FYI Kagi now let you pay in Bitcoin and sign up by VPN, with anonymous email addresses supported so we don't have any of your data," you'd get immediate subscriptions. Less than an hour's work would probably result in genuinely meaningful return by directly targeting places crypto users actually frequent.