Good points above. One thing I'd add, especially as someone who's used several different casino phone apps over the years, is that I wouldn't want my account to depend on the app itself.
Before installing, I would check that I can still log in through the normal website and access my balance, withdrawals, transaction history and responsible gambling settings without the app. Casino apps sometimes stop working after an Android update, disappear from an app store or simply aren't maintained anymore. If I have money sitting in the account, I definitely don't want an outdated APK to be the only way of accessing it 😉
Most casinos have both online and app versions, though several years ago there was one land-based Czech casino where I deposited a significant amount. When I was leaving and wanted to get my winnings, they told me I could also play through their app and have full access to my funds anytime, which was nice. But only for about a year😀 Then the app disappeared from the store while I still had funds in it, and the only way to access my money was to travel 50+ km to the actual land-based casino. It was eventually sorted without the need for the mileage, but since then, I prefer to create an account with a casino online first, and only once I know how everything works on my PC via normal internet do I add the app to my phone so I can bet and play on the go. I also agree that withdrawals are more important than how nice the app looks. I tend to judge casinos quite heavily on how quickly and reliably they pay, so I'd rather have an average-looking app from a casino that processes withdrawals quickly than an amazing app where I'm waiting many days for my money.
And one small thing I always check is notifications. Casino apps can send a ridiculous amount of bonus/free spin notifications if you allow everything, which can become annoying very quickly. I normally switch off anything I don't actually need. For example, you don't want to show your co-worker a presentation on your phone and then have 15 unrelated casino notifications appear on the screen. I've been in that situation and it's not nice, especially if you don't want to tell your colleagues or family that you gamble for money.
So for me: security first, but also make sure the app is only an optional way of accessing the casino rather than something you're dependent on.
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