The thing is, there is not always blackmail involved. Especially if Lena and Seymour get off to a good start, he is far more a simp for her. And to be blunt, it is not nice, but today even the "blackmail" contract is not unusual in various businesses. Look e.g. into the music biz where adhesive contracts (and worse than the one Seymour gives out) are completely normal. That Seymour wants to bind the raw diamond he found in Lena is not unusual in business.
And unlike some real-life companies we could name, Seymour only takes the gloves off and resorts to blackmail if the Lena situation goes completely off the rails for him. Which does happen only under specific circumstances.
Face it, the Seymour as of chapter 10.3 is hardly a bad guy, just a shrewd business man, he is not half as rotten as the antagonists of GGGB.
Exactly my man, you seem like an entrepreneur yourself.
"The raw diamond in Lena" is the bomb and you just delivered it.
Monopoly has always been the ultimate goal of businessmen. You wanna own something not because you are greedy or power hungry like actual villains are, but because you seek stability. It is the one thing every businessmen dreams of everyday.
You get to worry less about competitors due to potential acquisitions that would take your asset away from you.
The blackmails were insurance, so that Lena never gets tempted from "better" offers from others.
Basically Seymour was establishing loyalty and a shrewd trust.
I understand some of the views against it. Lena getting conquered and owned by a nasty old man who looks like Smeagol is quite awful. Tyrannical because he is owning her almost as if he is crazy about her. But that is normal for businessmen who found a gold mine that they dont want to share.
And he is indeed looking like he wants her more than just a moneymaker. There was clearly BDSM going on with them, some sort of 50 shades of bull vibe that might turn her into his sex slave.
Now that would suck, I dont want that either.
Though I wish Seymour would indeed get competitors over her and turn the whole half of the game into some sort of corporate war. Its up to Lena and Ian whether to work together or get help from others, make deals, alliances and enemies. Cindy could help, or she becomes a rival in the business, Ian(or Lena, lesbian content) could win her back etc.
Ultimately, whoever gets a piece of Lena's ass more, wins.
Literally, gets a piece of it. Stan is starting, and my bet is on him to win the corporate war.
Stan solos everyone.
Now THAT, is a plot.