Yeah, you see the data as part of your job.
And it doesn't include data from significant regions.
And, other than some internet jockey making a ridiculous claim, "government could not or would not interfere with that data!" there is no evidence that the government could or would not interfere.
I did look at that very nice PowerPoint slide show from ADS-B marketers.
Fancy, but likely false. Ground-based transponders are still operational (and still maintained for dependable operation) located all across the flat earth, performing the exact same functions.
Can you explain how you think
ground-based transponders would interfere with or plot false tracks of aircraft
over the ocean? Where's the evidence for them performing the same functions (same functions as what? Transponders in aircraft?
Oh no, I have access to global data, perhaps I wasn't clear. It's just not my direct job. I've been working with ADS-B for over ten years. I actually represent my country on European and global working groups on the subject. A group of us was discussing ADS-B accuracy in the SE Pacific only last week on an MS Teams call.
It's so tempting to sit in ignorance and say 'I don't know, therefore I can claim it's all made up/fake/government interference', isn't it?
As for 'some internet jockey', yeah not really. My name is Adam Spink, you can find me pretty easily on Twitter or Instagram. You know where I work. I've even written a few blog posts for my employer at NATS.aero/blog. I use the same forum username on the Professional Pilot Rumour Network (mainly sticking the the ATC Issues forum) where you'll find my posts, and the Flyer Magazine General Aviation forum, where my username is GonzoEGLL. Nice to meet you.
No significant changes to routes commonly used for hundreds of years have occurred
Sorry, you'll definitely have to expand on this one.