The Arch wiki installation guide lists that more then a minimum of 512 MiB RAM is needed to boot the live installer.
Other users noted that ArchISO 202005 breaks with 512MB of RAM.
I can confirm that iso 202002 still boots OK with 512 MiB of memory. Release 202003 fails back to interactive rootfs prompt with logged errors:
Initramfs unpacking failed: write error
and
/dev/disk/by-label/ARCH_202003 device did not show up after 30 seconds.
Which minimum amount of memory is needed to boot the Arch Linux live iso?