I have mixed feelings about this, but my gut reaction is that it's not acceptable. Mainly because inexperienced programmers tend to cobble together functional apps by leaning heavily on example code, and don't know that those examples have dangerous security issues.

Indeed. I've seen security advisories posted that hinge on people copying the "not for production" example code.

Thats an excellent point. (Speaking from being an experienced inexperienced programmer.)

I worked with someone on a Lisp project that monitors the bitcoin blockchain for new transactions, coins sent and confirmations. It could be converted into a type of address monitoring service for multiple blockchains - just needs work, but it's a solid piece of software.

I paid and worked on its development a few months ago, and have since stopped paying for hosting. But it's all there ready to go. I wasn't into altcoins at that point, but I can see a future in it now. It was called donebit.