[moebrowne]

They use Crockford Base32 encoding which does exactly that.

[benterix]

I don't think so since the sample key they present in the big image contains many of these. The caption is "An example API key generated by github.com/gofrs/uuid and encoded with github.com/agentstation/uuidkey." - so something is wrong.

[alt227]

You need to look harder at the encoding standard. After generation all o are mapped to 0 and all l are mapped to 1 so yes there are 0 and 1 but there are never o and l.

[hdjjhhvvhga]

Ah, so you need to know that first, otherwise it's still ambiguous to people reading them.