Yes, I did.
Why do I get a feeling that you are talking about some hypocrating isekai teenage, who, suddenly, found out that being a hero is not about looking cool and having a harem, and he surrounded not by NPC, but actual leaving and breathing people that bleed, lie, cheat, betray and can stab you in tha back?
As well, let me point out, that defeat and imprisonment was not Dark Lord "first rodeo". He already experienced that sort of thing, being even crippled in an all out war (his first defeat), and at that time, he was not scared by the prospect of been sealed, for an unknown amount of time, when you actually can do nothing but wait, I may add, and he did not cried his ass out. And what about now (at the time in witch game takes place)? If anything, he already should know, from experience, that, sooner or later, even if much later (he IS immortal after all), opportunity will come. On top of that, he was JUST imprisoned, NOT sealed, so he could plot, corrupt, deceive, slowly build up his influence and do so much more, IF he would take some time out of crying and self-pitying.
Again, we are not talking about insecure boy who's daddy did not bought him a pony on a birthday, we are talking about freakin Dark Lord, who should have come through hell, low and above, to build his Empire (the first time), since only through power, wit and decet he could build something like that in an "no man's land".
That was the lamest turn around! Ugh, it was so disgusting...
Damn, when there was no apparent and immediate way out of his situation, he was ready to wag his tail and lick the boots of Matriarch. But who would care about that if, in his mind, he would be seething with anger and plotting his revenge. But no-o-o, he wasn't! He was really ok with turning in and becoming his Arch-enemy lap dog! And when, suddenly, he was rescued, he immediately switched out and started to act all high and mighty.
Talk about a man with no conviction...