I am a little lost here. So correct me.

The Founder of the company decided to pour in his own money worth of millions ( assuming that is true ) into the company. He bootstrapped it.

They were on track to becoming profitable. And now, as the replies shows they are now profitable.

He decided to spend some money to buy everyone a t-shirt as a gift.

And all I see is not thank you but anger and frustrations. Pointing to waste of time as if the product is going downhill or not iterating fast enough. But in fact according to changelog they are doing pretty well.

Spending my own money to say thank you in my own way and all I got was, all these negativity.

I just don't get it.