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I don't think it's possible too unless there is an 0-day vulnerability in the browser app you are using or you allow the website to download fies on your device. In any case, it's always recommended not to use the device in which you store your important files and data to access random or unknown websites.
As long as you don't download files from unknown sources and don't click on suspicious links, you should be fine.
Having multiple device is really recommended since you can access anything you want to see on other device which doesn't have any stored important details so users should think also to have this for added security measure. To many harmful links scatter in internet and we don't know which of them is legitimate so to seek for the real especially the bonuses or promotion advertise by casino we must have this so that we can view the contents without worrying about those malwares.
Having multiple device isn't full proof, what's the use of it when most of the thing contains in it are the same then? You can have one or two device but things like private keys, passphrases, etc. should be kept in safe place/s and all accounts should have added security features like 2FA, utilizing multisig addresses and many more to add your account's security.