Yes, the casinos can and do control how much of an edge they want to have in blackjack by picking and choosing the different playing options on their tables. They can make their blackjack games very tough to beat, even impossible to beat, or give players a break and offer a competitive blackjack game. Score one for the casinos. The Betting Spread. Another not so trivial point.
Casinos dictate for the most part what minimum and maximum bets they'll allow at their tables.
The maximum bet that is allowed in most casinos is far less than the casino's total bankroll. This is no accident. It never will happen in my or your lifetime. Score another one for the casinos. Casinos make it easy for players to get access to betting money.