Nothing works for "free" they ask for donations. And just cuz you don't wanna use an app doesn't make it useless or an app "we don't need". Also there's not "tactics" to make you pay, guy's just asking you to pay to remove ads, they made the app, it's their choice how it should work. You're not expected to buy it or use it, it's just out there as an option if you want to.