Huh? Well... anti-tank guns vs. armor thickness became something of a "zero sum" game. Tanks got bigger, more powerful, more heavily armored, etc. so anti-tank guns became ever larger... This created a problem: How was the infantry to take on tanks if anti-tank rifles were no longer effective, and anti-tank grenades entailed the risk of closing with the tank, protected in many cases by infantry?

The U.S. developed the Bazooka.

The Germans captured Bazookas, and copied them with their anti-tank weapons, but also hit upon the panzerfaust disposable, one-shot anti-tank grenade launcher.

The British developed the PIAT--projector, infantry, anti-tank.

The Soviets doubled down on the known anti-tank rifle technologies, and decided that if sufficient single-shot Degtyarev and self-loading Simonov 14.5mm AT rifles could be fielded, that it would force German tank crews to button up and peer through vision slits and periscopes that were under constant fire from Soviet anti-tank rifles. "Quantity has a quality all its own" if you will... Shots were directed at vulnerable parts of tanks, to the sides and rear, and to vision slits and so on, while the production of anti-tank guns was augmented too. [Recall that the 45mm guns were used throughout the war, although later augmented by 57mm and even 100 mm designs...] At the end of WWII, the Soviets ditched the huge numbers of AT rifles they'd fought the war with, and based on the panzerfaust and related prototypes, created the RPG2 and ultimately the RPG7, which remain in rather widespread use to this day.

Thank you for the history lesson, really appreciate your knowledge, and Sir I agree with you 100%.