Maybe I was too late by just doing my test today, but I had no success using telnet on my machine as well as on my mobile using 2 different ISPs (normal fiber + mobile phone company via 4G). No firewalls were active for the test and I also tried it additionally via a VPN provider to ensure no ISP filtering happens.
C:\>telnet 126.96.36.199 63429
Connecting To 188.8.131.52...Could not open connection to the host, on port 63429: Connect failed
Looking at my TCP viewer I can clearly see that a SYN package was sent, but nothing is coming back (SYN/ACK is missing) as the 2nd step for a TCP handshake. In all cases I simply get a connection timeout, which makes me feel that might be an issue with the remote server not wanting to talk to me rather than a problem on my end.