Ok, but what do you think would happen?
They will "provide years of service" - if you don't fire them.

FWIW, I would not fire an S&W with a cracked frame in anything short of an absolute emergency.
Ok, but what do you think would happen?
Are these cracks caused by metal imperfections, overpowered cartridges, over torquing barrel, or magic?
Did the alloy Colt Cobras and Agents suffer the same frame cracking?
I'll probably put 200 through my 442 this weekend. One of many such weekends.
A couple of weeks ago I came across a Centennial Airweight, nickel with bug screw and high horn grips. A bit worn on the finish but timing and lockup were great. $499
Then I looked at the frame under the barrel and there it was, a crack all the way through.
So back to looking again.