Don't forget your also pulling with only 3 fingers and not having your shoulders right, your pulling with your arms and not using the muscles in your back.
Only Compund goes up to 70lbs and that is because they have a 60-80% let off so you can hold it at full draw. Holding a 40lb recurve bow at full draw is hard work, much more so than lifting a 40lb dumbbell because you are drawing it across your body rather than lifting it up.
Bear in mind that the 15 arrow Olympic shoot is designed specifically to make a more interesting spectacle, a competition shoot can be 12 dozen arrows, so you need to draw that weight 144 times...
But if you want to think it is easy without ever picking up a bow then go for it
Oh come on, give me some credit. I'm not just picking up a 40 pound dumbbell off the floor and going "yep, can do that".
Bent over rows are used by people who do archery to strengthen the same muscles they use for drawing a bow back. I can draw a 20KG plate back with 2 fingers very easily (doing a bent over row). I can do it with 30KG, it's not really hard.