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Yeah! This is definitely a marketing technique to keep the player in the game longer at a given casino. I agree, of course, that 5x is still a lot, but we should all take into account that many players, starting to play in an unknown casino, do not read the ToS at all, where these parameters for the deposit should be specified. However, I’m not sure that all casinos print such data clearly and clearly so that the player understands everything in advance. But it still has to be done in some way. Such a large coefficient of course irritates the player, the player becomes dissatisfied, swears and grumbles to himself, but is forced to continue playing.
This is actually what the casino itself needs. And this casino evaluates as marketing.
The average user, myself included, gets very bored reading entire ToS pages. In fact, reading the ToS page is the most important part before we register on a particular site, this is of course intended so that we never blame their terms of service which we have previously agreed to.
But however, there is always an not good feeling when one of casinos expect you to bet more than other casinos after you make a deposit so that you can safely withdraw your fund. Of course it's each individual's way of marketing, but a pleasant and convenient user experience should be considered instead of expecting them to bet more.