Okay, thank you for the... clarification. Where do you get or implied it from? A quick search on GekkeBelg's post seems bear zero result of him talking about this specific technic, so I think he doesn't make it public.
I analyzed his bets and compared the odds. The pattern is the same every time.

Soft

Sharper
These types of edges are small, but it's enough to profit in the long run.
And determine the best platform to place the bets according to those comparison. Thus, value betting.
He's a live value bettor, and there's nothing wrong with that. The goal of sportsbetting is to turn a profit. As long as he didn't break the rules, the sportsbook have honor his bets.
The funniest thing is that Bc.Game is coaching people on how to value bet:
https://betting.bc.game/betting-academy/types-of-bets/value-bets1. Teach value betting. 2. Void all the value bets. IQ 200
Now, that is the good practice of using ToS from casino's side. That thing works both ways.
It should be a massive red flag to all the BC.Game customers. You don't want to win a 30k$ parlay on the site that has every right to void your bet.
Please rephrase.
There are a lot of reasons why sportsbooks don't add rules about value betting. It would be incredibly off-putting for all the customers(Even the losers) and in a lot of cases, it's almost impossible to tell if somebody is value betting.