I'm, however, specifically talking about public-facing services like HTTP(S), which also get blocked with this "I'll just indiscriminately blacklist IPs belonging to countries I don't like" approach.
The most general problem in Internet are not the malicious people - botnets can infect insecure devices ANYWHERE in the world. The main problem is that some (many) of the ISPs at the last mile allow outgoing IP packets with source IP address which is outside of the IP range(s) these ISPs operate/own. Larger ISPs on the upper layer can not prevent this because otherwise IP routing will break. So it all depends on the "last mile" ISPs. And it is quite possible for the "status quo" to live for many years ....
https://www.internetsociety.org/resources/2022/impact-of-ukr... https://labs.ripe.net/author/athina/how-sanctions-affect-the... https://labs.ripe.net/author/farzaneh-badiei/sanctions-and-t... https://www.sciencedirect.com/science/article/pii/S030859612... https://labs.ripe.net/author/moritz_muller/internet-sanction...
The voices here that say "I block everyone, don't bother me with your whining" .. it is a security practice.. OK. security is not the whole story of civilizations; obstinate thinking leads to ignorance, not evolution.
The topic is SSH, an administrative and secured access. Yes security applies. to be on-topic