spinner_toSrLong time lurker here, so here is how I pick an online casino these days. After getting burned once or twice I stopped trusting the big banners.
I always start with licensing: see which authority is listed in the footer, because some sites quietly block certain regions. Then payments: I want at least one fast e-wallet option, and the withdrawal limits need to be written clearly.
Never judge a site by the bonus alone. Read the wagering and the max bet rule, and some games count less towards it. A good recent review that covers all of this is here [url=https://www.akwaswiat.net/member.php?action=profile&uid=53923]Wildrobin[/url] so you know what you are signing up for.
On mobile I mostly use the browser version, so I check how the lobby works on a small screen. Ask support one simple question first: if they answer in a couple of minutes that is a good sign.
Anyway, that is my routine. Only play with money you can afford to lose.