Anyone can name an ISP that blocks outgoing TCP/IP connections to port 8333? And where such a block isn't a voluntary one (some sort "Internet safety" option) and the unblocking isn't a self-service "turn it off" checkbox?
How about incoming TCP/IP connections to port 8333? And where such a block can be lifted and isn't a technical restriction stemming from the use of CG-NAT or DS-Lite?
I can only talk about what I have personally tested:
Cabletica, ICE, Kolbi, Claro, Moviestar all need to be called and asked to open this port.
I have to call to open many ports blocked by default for BTC or other uses like CCTV.
I also see many other posts around the world making the same complaints.