The use of SNMP v1 is widespread. I've worked on three projects with major well-known (like REALLY well known) telecom companies and computer companies. In all three they required from us SNMP v1 only.
If you've ever run a management tool outside a firewall and tell it to go discover whatever it can find, you'll find thousands of SNMP v1 devices out there with the 2 most obvious community strings protecting them.
But that's nothing because you will find dozens of companies who subscribe to your ISP who don't even have firewalls.
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The use of SNMP v1 is widespread. I've worked on three projects with major well-known (like REALLY well known) telecom companies and computer companies. In all three they required from us SNMP v1 only. If you've ever run a management tool outside a firewall and tell it to go discover whatever it can find, you'll find thousands of SNMP v1 devices out there with the 2 most obvious community strings protecting them. But that's nothing because you will find dozens of companies who subscribe to your ISP who don't even have firewalls.