I've never seen anyone who gambled at work yet but when the Zynga Poker on Facebook was a big trend, many employees do play that game and I am actually one who did that too. It's not gambling because there's really no money involved unless you buy the chips just so you can play the game more the whole day. That I never did.

Don't do this both, it's just a waste of time, we have our breaks, and we can check our social media or gamble for a bit on our smartphone if we want to but when we sit down in front of our job, we should be focused.
Is solitaire counted here because I play a lot of this game while working since I always have some waiting time when waiting my clients feedback on submitted proposals.

You are lucky in your company that facebook is allowed to access back in the days when Zynga poker is popular. Smart phone is not that popular that time which means there’s no other means to play at work than using the PC. Seriously, Who have the courage to play at work here especially gambling while you will risk tainting your career once you are caught. Worst is you will be banned on companies that has connection to your current employer.
Things are different these days and I know that it wasn't so possible in the olden days, this is even as the casinos you would want to bet with were not many then, so you might not even find the online ones of your choice at that time, not to talk of the mobile version. The companies I worked for at that time though gave computers with internet connection but limited the usage. While the mobile platform to bet was scarce because those who even started then only allowed the PC version, and coupled that the company policy will not allow you to use the internet during working hours, it wasn't encouraging at that hour.
They've set their computer in such a way that you can only have access to intranet during the office hours, and immediately after office hours which was always 5 PM of my local time, you usually have every access to the internet. But still, there is a limit to what you can do with the office computer and internet, or else, you might be speedily showing yourself the very way out of your feeding means. This is not worth it even if gambling was allowed then.