They dont owe you anything, you're not an investor. Imagine if you were selling something and a bunch of assholes who spent less than half a penny on tiny little pieces of your products started demanding you increase their value because they think they're the reason you're even alive at all. Unless you bought in with hundreds of thousands at a minimum you're all just a bunch of ants who spent more than they should have

what the fuck do you want them to do for you anyway take time off their actual work to write you a thank you letter? If anything asking devs to do anything more for you is actually harmful to you in the end because you're only distracting them