I don't know about the deep learning side of things, but on the mining side of things, over the past month, my calculations are that ~50,000 GPUs are added to mine the major GPU-minable coins every day -- from roughly one million GPUs on April 1 to about 3.5 million GPUs now. At an average of $250 revenue per card, that'd work out to ~$13M revenue per day in GPU sales for cryptomining, split between AMD cards and NVidia cards. This, however, is up about ten-fold from March, and in all likelihood will return to those levels as mining returns inevitably decline.
Source of this data is my own calculations using historical data on mining difficulty for the various coins, plus benchmarks for typical/optimal-ish GPUs used to mine each coin.
Yes, I am assuming that all mining is done with GPUs for ETH/ETC/ZEC/XMR and some others. I'm only including coins which are currently profitable to mine on GPUs, which I take as an indication that those algorithms have seen little/no efficient ASIC implementation yet. I'm thus not including bitcoin, since GPUs are little more than space heaters mining bitcoin; and I'm not including e.g. lbry and litecoin and some others because I don't know enough about the ASICification of those.
It's possible, though, as you suggest, that there are some folks running ASICs or improved hashing algorithms at a small scale, small enough not to overwhelm profitability of GPU mining but large enough to muddy calculations which assume that all mining is being done on GPUs.
Source of this data is my own calculations using historical data on mining difficulty for the various coins, plus benchmarks for typical/optimal-ish GPUs used to mine each coin.