You're not the only one. I don't get why they couldn't have named it something that wasn't very similar to something already around for several decades, or at l

You're not the only one. I don't get why they couldn't have named it something that wasn't very similar to something already around for several decades, or at least insist on the shortened ATproto name (one word, lower case p). Sure, in practice, no one will actually confuse them, but that could be said for Java and JavaScript.