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Are there any numbers out there how often 443 udp is blocked on wifis?

Why would this port be blocked?

Because nobody needed it for a legitimate reason up to now.

On public wifis they might not want you to do anything weird, so they block everything except "web ports", i.e. 80,443/tcp

And dns 53/udp otherwise you do not get far.

Sometimes that's blocked too, you're forced to use the local DNS server, which is the only one authorized to access port 53/udp out.