Apple charges

There are many possibilities for apps that charge $2.99

One charge for an Apple service that is $2.99 is an iCloud storage plan that has been upgrade to 200GB: iCloud+ plans and pricing - Apple Support

You may want to use the following instructions to see what it is that you are being charged for: If you see 'apple.com/bill' on your billing statement - Apple Support

You can check if you have any active subscriptions here:

Settings > Apple ID > Subscriptions

You can also get an overview of all your purchases and request a refund here:

Request a refund for apps or content that you bought from Apple - Apple Support