Very handwaivy but the devil is in the details of that "all they have to do". Copying success is not that straight forward or else AMD would have had a response to Conroe in 2007, Intel for Zen in 2018, and Qualcomm for A-chips around 2014.
My key assumption is that there's some pareto principle at play--80% of the M1's performance gains over the next best generic ARM chip are due to a handful of key innovations while the remaining 20% come from a long tail of incremental improvements. This would mean that generic manufacturers could copy those handful of key innovations (modulo IP rights, which might be another fatal flaw in my speculation) and recoup 80% of that performance gap in just a few years. If that assumption is bad and the performance is entirely an accumulation of lots of minor innovations over time, then I suspect it will take chip manufacturers quite a lot longer to catch up.
When iPhone came out in 2007, Android did not even exist. [1]
[1] https://en.wikipedia.org/wiki/Android_(operating_system)
> An early prototype had a close resemblance to a BlackBerry phone, with no touchscreen and a physical QWERTY keyboard, but the arrival of 2007's Apple iPhone meant that Android "had to go back to the drawing board".
I guess Android, or what morphed into Android, was probably being developed, in a pre-beta state, when iPhone was announced in January 2007. Okay. It sounded to me like someone was saying that Android was released on Blackberry-like phones at the time iPhone came out. That was only thing i was objecting to. Sorry, a small point I almost didn't even bother to make, and probably not helpful to anybody, anyway.