It seems pretty clear that these FPV drones would be able to penetrate into the ammo stowage of the M1 with a solid hit to the side, rear, or top of that area but considering that they've also managed to penetrate down to the T-90's autoloader with a hit in the right area I don't think the Abrams is at more of a disadvantage here. From the crew's perspective the odds of surviving are a lot better even if the tank is knocked out or destroyed.
Seems like everything is called an FPV drone these days but to be more precise I am guessing these are mostly loitering type munitions like Lancet, Switchblade, or that budget Iranian one? How capable are the HEAT warheads they are usually carrying? I'd have to guess the charge itself isn't very powerful but their ability to hit the right spot very much offsets that. The roof mounted ERA casettes on the T-series might prevent penetration if they get hit but it is simply impossible to cover every part of the tank with this. The issue is that these munitions are usually able to get the best angle for a hit. They can circle around unopposed because there is a lack of assets to knock them out the sky. As for additional protection like the so-called "cope cages", those are probably only useful against the cheap drones dropping RPGs, grenades, or whatever sort of submunitions they strap to them.
If anything there must be a huge demand on both sides for short-range air/drone defense systems. While less than ideal for numerous reasons I've got to wonder why we haven't seen more examples of digging old systems like the Shilka or SA-9 out of storage, which is better than nothing. Despite thousands of Shilkas having been built they seem to have been pretty rare and most spotted are lacking their radars.