I've read this article which was written by the SIA developer:
https://blog.sia.tech/the-state-of-cryptocurrency-mining-538004a37f9bIn it it is explained the view how the ASICs are produced in secret, mining the coin in secret permanently or the big companies like Bitmain they mine with ASICs until they get their returns, then sell them to the public. People naively buy them in order to make some money but the real game is actually done by producers or big farms which don't even release their ASICs to the public.
What I didn't know too is that the ASICs can be produces to resist the hard forks and be hard fork flexible in a way, depending on the algorithm and the way they were produced.
It was explained how the Bitmain produced the ASIC for Siacoin and made the profit and developers couldn't do anything about it. It seems that everything regarding the mining is in the hands of hardware manufacturers.
I highly recommend to read the whole text, I learned a lot which I didn't know from it and I am now astonished how many secret games are playing in the background in the cryptocurrency mining game.