to guys spitting on developers like djm34 and wolf0: probably you don't know that many public opensource miners and algos where made by them.
they could just let you mine with cpu and their customers with gpu.
if you continue to bother them (and me), that's where you'll end up.
so please think before speaking.
They are... but they usually release a slower version then release a private version with a higher hashrate and/or they get commissioned to make the miner in the first place. That's not the same thing as charity or doing it 'for the community'. Some cases it's even double or triple dipping (getting paid two-three times over for the same work).
I'd look at the work and why they did it in the first place before thinking it's charity. They don't do bad work, but it's 'work' and not freebies that you'd think from a first glance. If a coin dev or the community commissions them to make a miner for their coin, those are who you should thank, not them.
But most of the time you can't tell what's going on because they keep everything hush-hush to prevent prying eyes and ears from figuring things out.