Probably tripping some client fingerprinting/fraud detection system because it thinks of it as an anomaly mistaking it for a bot or something. Unlikely to be intentional malice against Asahi users.
For a time I couldn't access a number of website because Linux+Firefox was apparently too rare, with Linux+Chrome at least I could pass a captcha (was Akamai I believe).
Or should fraud protection err on the side of stringency, where all fraud gets caught, but at the cost of getting innocents blocked too (in some greater number)?