Why does every booking tool either charge per seat or take a cut of your revenue?

I've spent the last few months frustrated by the same problem.

As a freelancer/consultant, every time I wanted to charge clients for a session or consultation, I ran into one of two options:

• Calendly: $11/seat/month. A team of 5 = $55/month just to share a calendar.

• Most other tools: flat fee + a percentage of every booking you take.

Both feel like a tax on selling your own time.

So I built Onbookr — a booking platform with one flat subscription and 0% commission on bookings. What your client pays goes directly to you.

It has built-in payments (Stripe, PayPal, Razorpay), WhatsApp + email reminders, a drag-and-drop booking page builder, and an embeddable widget.

Launching on Product Hunt on June 3.

My question for this community: if you charge for your time (coaching, consulting, freelancing, photography), what's the one thing your current booking tool does that frustrates you the most?

Genuinely asking — trying to make sure I haven't missed something obvious before launch.