Long time lurker here, so here is what I look at before signing up anywhere. After trying maybe a dozen sites I stopped trusting the big banners.
Licence comes first for me: see which authority is listed in the footer, because some sites quietly block certain regions. Next come deposits and withdrawals: I want at least one fast e-wallet option, and there should be no weird fees on cashouts.
The welcome offer is where most people get caught. Read the wagering and the max bet rule, and live tables often do not count at all. A useful overview with bonus rules, app info and payment methods is here [url=https://joy.link/cryptoplaypicks33d7#rolletto-uk]Rolletto[/url] so you know what you are signing up for.
On mobile I mostly use the browser version, and if there is an app I make sure it comes from the official page. Support matters too: a real human reply beats a bot loop.
Hope this helps someone. Set a budget and stick to it.