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In 1995, the OBD2 standard was born from something similar to this.
Unfortunately, there is absolutely no competition, nor viability for them to decrease prices. There is a ton of work that goes into figuring this stuff out, and they'd like to be rewarded for the work on the rare occasion someone benefits from it.
Imagine if you were a one man team who made a harness and decided " HEY, I'm going to sell the CANBUS harness for using a H22 engine in a BRZ! Even the speedometer and fuel mileage functions will work!!"
After 4 months, you've done it. Every night after work, while your kids wonder where you are and your wife cries in the kitchen a you toil away, you promise them their sacrifices will be worth while. You register a domain and market your product. you're asking for $800 bucks because you want it to be fair.
9 months later, someone asks a question about your H22 swap harness.
"Hey bro, will this work on the H22A without Vtec?"
and you think to yourself "Shit, the motor I designed this for had VTEC. Uhh....maybe? Buy it and find out?"
2 years later and you still don't have a buyer, and you wasted months of your life and created a void in your family. BillyJo has daddy issues and your wife left you for Hank, the man who was mowing the lawn in your absence.
EDIT:: I just realized, I totally misunderstood what you were asking. You meant the software, not the work going into making it translate.. I'll leave my comment for humor. There is no standard because nobody wants there to be. Until people stop buying cars because of their software, it will continue to be a thing.
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