Can’t cancel YouCam subscription??

If an app has a subscription associated with it, see -> Delete apps on your iPhone, iPad, and iPod touch -> Delete apps on your iPhone, iPad, and iPod touch - Apple Support

• If you delete an app, it doesn’t cancel in-app subscriptions that you might have. While deleting an app, you might see a Cancel Subscriptions option. Learn how to cancel your subscriptions.

If you don't want to continue a subscription you need always to cancel that subscription in time, see the following Apple articles:

If you want to cancel a subscription from Apple

If you want to cancel a subscription from Apple - Apple Support

If the subscription that you want to cancel is not listed

If the subscription that you want to cancel is not listed – Apple Support (UK)

See also YouCam info:

Apple will ask you to accept the App Store subscription terms and request permission to provide your information to YouCam Perfect.

By joining YouCam Perfect Premium, you will confirm your acceptance of Perfect Corp’s Terms of Use (https://www.beautycircle.com/info/terms-of-service.action) and Privacy Policy (https://www.beautycircle.com/info/privacy.action).

• This subscription auto-renews at the end of each period (1 month/ 1 year), unless cancelled within 24-hours.
• The subscription fee is charged to your iTunes account upon purchase confirmation.
• You may manage your subscription and turn off auto-renewal by going into your settings after purchase. Cancellations of the current subscription are not permitted during the active period.