No they dictate what their program (Paint) can generate. Nobody is forcing you to use it.
After they sell it it's no longer theirs. Makita can't come to me and tell me what I can and can't do with their power drill, it's mine to do what I wish. They build it and sell it but once payment has been tendered that's where their possession rights end.
They sell you a license to use the software, so you can't for instance redistribute MS Paint as your own software. But you could certainly hack it not to phone home.
This is purely the choice of the vendor. Makita may not do this, but John Deere absolutely exert control over how their products are repaired and maintained.
Microsoft dictates what their software can generate, much in the same way they dictate what colors you can use in paint and what font sizes you can use in word.
You can still generate as much porn or whatever it is you want to generate using other software.
It's not the same thing. When you change the font size, Word doesn't upload your entire document to the cloud to ensure your content aligns with MS's corporate puritanical value system, freezing the entire UI for 10 seconds while it waits for approval from the Microsoft censors before finally allowing your chosen font size.