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What mechanism could be the issue? Europe has net neutrality, so isp's shouldn't mess with things like that.

A failing vodaphone Twitter cdn seems unlikely? Since that would mean breaking https

I assume some government censorship feed has gone wrong. Like CleanFeed or something that has incorrectly blacklisted domains or such.

Find a proxy or use a VPN.

YMMV

Maybe peering ? Vodafone's internet was always crappy.