I think there’s a real chance Clover Press is rushing this because in a few decades, Spider-Man is going to start falling into the public domain. His first appearance was in Amazing Fantasy #15 (1962), so under current U.S. copyright law, that issue is expected to enter the public domain on January 1, 2058.
By republishing these old strips now and packaging them nicely for collectors, they might be trying to squeeze as much money out of these early stories before they lose exclusivity. It’s possible this is a last-ditch effort to monetize properties that will soon be open for anyone to reuse.