That's a good question indeed! Yes, those are great examples of common subscriptions people may have forgotten about. Online streaming platforms especially, because they are often set up to automatically renew and charge you monthly without any reminder. Gym memberships are another good example - they can be quite expensive, especially if you're not a frequent visitor.
I also find that some insurance policies can be reviewed annually to ensure that we aren't paying for more than we need. Health and life insurance, for instance, may have varying plans according to different life stages. Magazine subscriptions seem mundane but are often overlooked as well. It's good to check in now and then to see if you're still enjoying the magazines or if they've become more of a clutter issue.
And if you're really conscientious about your finances, keeping track of expenses for a month (or more) may open your eyes to other areas where you can cut back. People often underestimate the little things that add up: that extra coffee or snack you buy without thinking, or that takeaway meal because you were too tired to cook. Using a budgeting app may help with this.
Another way to save could be to plan your shopping trips better. Meal planning and making a grocery list can ensure you only buy the ingredients you need, instead of impulse purchasing while you're hungry and ending up with wasted food and wasted money. For me, meal planning ensures I eat healthily too! But one has to be disciplined enough to stick to the plan and not deviate!
I hope these tips help! It's quite fun sharing these hacks and learning from everyone else too.