There is actually one use case for it. I create a yearly backup that i distribute across my friends (mostly via CD-ROMs) which include all my files that i can't afford to lose, like encryption keys, keepass database, crypto wallets (everything that isn't encrypted data gets aes-encrypted via gpg and a 512-bit key which is stored in the keepass database). But if say a malicious actor gets access to it by social-engineering they could start brute-forcing the keepass-database (good luck though with my passphrase and 10-rounds of argon2 with 4-threads and 4gig vector size), by splitting it into fragments that vector would be closed.
the hardware requirements for ChromeOS flex are met by almost any small form-factor pc you can get. See the installation guide and the instructions for non-certified devices.
I used DWM for a year or so (still do use it on my librebooted 2008 T400 gentoo thinkpad just to stay below 100MiB of memory after boot for the lols) and recently switched to sway.
My primary reason for sway was it being relatively simple and to try out wayland (which works with minor bugs in xwayland). Initial configuration took me about 1h and i wrote a small program in rust to populate the title-bar. Works like a charm and i like my stuff to be simple so i don't think i will look into different TWMs.
streaming torrents is a thing as far as i know, so that may be an option (although rarely viewed videos would vanish if no one is dedicated to seed them).