[pjc50]

Port 23 has been filtered by most providers for decades.

This is why everything converges on using TLS over 443 or a high port number. I don't see this as a huge deal, and especially not one deserving all caps rants about censorship. Save those for things like FOSTA/SESTA.

[gzread]

Not by tier 1 transit providers. You pay those to deliver your packets, no matter what.