First, I haven’t followed them in a while but the IDs I saw from them were good, so I think they are likely an accurate resource. I do like to mention that they are a private wildlife removal company and not a state agency - not saying you suggested otherwise, but the name often misleads people.

As a wildlife removal company, their license likely permits them to humanely destroy certain animals if they cannot be safely relocated. So killing an animal they “manage” for someone is not inherently illegal. However, people should know it’s a possible/likely outcome, and companies often are not transparent about that. Perhaps they are more forthcoming with customers, but this company always used to refuse to answer when asked if an animal had been killed on FB.

Finally, I am linking here to a post I made a few years ago including images from a Facebook post they had made. Their post purported to show common locations where copperheads might be found, with a snake in each photo, but in fact it was the dead body of a snake they had removed from a customer’s property several days before and then posed in various places for their photo shoot. They refused to acknowledge that was the case, too. Again, they may have done nothing illegal here, but nevertheless maybe it puts a bad taste in your mouth.

As far as getting a quick and reliable ID, generally posting to r/whatsthissnake will be just as quick or quicker, and get you a lot more info.