When a card is the wrong tool for a given site
A card casino is two systems glued together: the lobby and the card network. Most surprises sit in the glue. The first card payment should be small enough that a hold is irritating rather than serious. If chat cannot explain a hold in plain words, you already have a measurement of the site. Unused card-linked accounts are clutter. Close what you will not use. The points that matter for this choice are summarised at credit card casinos.
A few minutes on the cashier and the terms usually costs less than an unprepared first hold. Note the date on the terms. Cashiers change. Comparing official text with a written cap on time and spend is more reliable than an old review. If a point is unclear, asking support before a larger payment is cheaper than asking after a hold. Unused accounts are worth closing.