You may want to check Activity Monitor > Disk > Kernel_Task for Disk Write. This shows how much swaps write, along with other apps you have been using since your last reboot. You can check your last reboot time in System Information > Software.
Currently Launchd wrote 50GB which I have no idea why. Corespotlightd wrote 70GB. And SafariBookMarkagent with 4GB. And Kernel_Task 4.5TB.
These numbers are over the course of 30 days.
Generally speaking Mac has been very Swap heavy for a long time. And Big Sur seems to be pushing this further as there are evidence shown this isn't seems to be specific to M1.
On Safari, if you have lots of Tabs, Clicking Tab Overview will force all Tabs to Reload. Which will write hundreds of GB of Data if you have lots of Tab, especially if they were originally sitting idle. ( i.e You close Safari and you reopen it where Tabs not focused are not loaded ).
If you have iCloud Drive, there may be some cases where you are downloading few hundreds GB of iCloud Data a day if you have certain Apps that constantly update its files. WhatsApp Backup used to ( and may still be the case ) cause this problem if you have a large WhatsApp History. WhatsApp download a 50GB copy, only to realise it has a new copy on iCloud and re-download again. Doing it many times per day.
Assuming some tweaked options, iCloud could be downloading all of your iPhone / iPad Backup to your Mac as cache. Again, if you have 100GB of Backup and that is downloaded once or twice per day. It adds up.
Disabling iCloud Drive tends to help.
Last time we had Electron Apps, or specifically Spotify making hundreds of GB per write per day due to a bug.
But as usual, Apple apologist around the world are quick to point out these are non-issues. Luckily HN still have some sanity. Hopefully this is finally enough to finally push Apple to fix it. Windows or Linux doesn't have the same write data count even when the usage pattern are roughly the same.