I only know the Silca brand from a pump that I got for $5 at St. Vinnie's. There are dozens if not hundreds of bike pumps on Amazon and AliExpress, including many that seem like the same pump being sold under different brands like GOBUYMD and PROOGMEF. I imagine they manage their costs so they can afford to eat the returns. That's the future of retail.
If Silca goes out of business, someone will buy the brand, like Motobecane and Schwinn.
I got a good pump at Target. I was able to confirm that it works before buying.
That could actually be a win-win, since return fraudsters now have no method to do their work, and you have the opportunity to pay with anonymous methods.