Should not set it to nonsense, but rather low-entropy. If its unique, someone with access to old (browser, probably) crash reports might be able to cross-reference. Plus, not too long ago browsers did not care to sanitize the path for input[type="file"], so some websites remembered your account name somewhere in their database.

His account name could just be 'satoshi'. Or similar.

That particular alias is mildly interesting. The obsession is with finally making progress in understanding the "We kill people based on metadata" threat. Maybe we can please finally stop stuffing PII & timestamps into each "crash report" and every "telemetry ping" and get back to work towards 100% reproducible outputs. (Well, right after I "enable javascript and cookies" because Cloudflare/Fastly/Akamai refuse to talk to me before they can grab a unique fingerprint..)