Is it natural that the Napoleonic wars ended in complete defeat? What contributed to this?

We can say that in some way this was a natural outcome, because Napoleon captured large territories in a very short period. Naturally, such states do not exist for a long time. On the other hand, Napoleon had a lot of opponents, almost all powerful countries of Europe were opposed to him. Naturally, when Napoleon gave up the slack, they immediately took up arms against him and defeated him. This is how the French emperor knew his downfall.