For what it is worth, I won't be paying $100 for Sync Ultra either. But I'm not going around accusing a dev of hiring paid actors to promote his app that already has multiple posts on the front page of the fediverse.
You are not just "being critical" you're accusing them of being malicious and I am calling you out on that specifically.
Idk dude, it doesn't take a dummy to understand that not everyone is out to get you, if you can't understand that then I can't help you.
I hope you're not using any closed source software elsewhere in your life, otherwise you're a hypocrite against your own beliefs.