1. Why would anyone spend the kind of money necessary to buy one of the M1 Macs and then nuke the warranty by erasing the drive and installing a Linux?
2. Related to above... given the limited disk (really SSD) space (256 or 512 GB, expandable to a max of 2 TB very expensively at point of purchase, not expandable afterwards except by using external USB or Thunderbolt drives), is there a way to create a separate Linux partition and install a bootloader of some type so that users could dual-boot Linux and macOS? I rather suspect that Boot Camp ain't gonna work, and it wasn't that fond of Linux on Intel hardware in the first place. At least it wasn't fond of Linux on Intel hardware sometime after Apple started supporting Win 10 in Boot Camp, not in my experience, anyway.
3. Allegedly there will be versions of VMWare and Parallels for Apple Silicon, Real Soon Now. (I'm not holding my breath waiting.) Wouldn't it be better to run a Linux in a VM? That's how I have Mint and Ubuntu running on various Intel Macs right now. Frankly, I got tired of trying to get Boot Camp to work properly with Linux (it has problems with Win 10, but at least Apple says they're fixing those, they're ignoring Linux in Boot Camp completely, so far as I can tell. Corrections welcome. Not holding my breath waiting for those, either.) and just lit up a VM. I did the same for Win 10. Dual booting is annoying, VMs are slower but more efficient unless I need the full power of the machine... and if I need the full power of the machine to do something macOS can't or won't do, getting a non-Apple system, usually by buying parts and building it myself for my personal use or speccing out a serious business system from a serious vendor (that is, not HP or Dell) for the office, would be more efficient. I'm currently typing this on a hand-built Win 10 system, which started as a Win 7 system in 2012. It was fairly powerful in 2012 but is starting to show its age and will be replaced by a new build system some time this year.
4. What will they do when Apple changes the (undocumented) boot system, which I'm absolutely certain they will? I'll put up serious money that there will soon be a M2 or some other evolution of the M1, and that things will change re booting the new system.