Y’all are ridiculous. $20 is less than the median hourly wage in the US for both men and women, even worst case scenario you’re earning $7.25 an hour so almost 3 hours of work to pay for ad free Sync. I challenge you to make a better app in those same 3 hours so you don’t need to pay for it.
Not only are you paying for the app as it is now, you’re paying for years if not DECADES of updates too. All done by ONE GUY.
If you don’t like it, don’t use it. Stop character shaming the dev for trying to make an honest living creating an app a LOT of people (including myself) wanted.