These headlines are annoying and what I consider to be "fake news". -- EG They are blowing up some factoid or partial fact to make a false impression.
Here's the reality--
-- Ethereum is going to PoS soon. Even if it doesn't fully switchover it will decline in profitability for miners quite a bit.
-- Ethereum is down %50 in the past couple weeks. The GPU boom is over (for now) and supply should be loosening.
-- There are just not that many coins out there that are GPU mineable to support really massive operations, like a full 747 of GPUs. BTC is $45B and ETH is $18B market cap. As far as GPU mineable coins looking at the top hundred on CoinMarketCap I see about $2-$3B market cap for them all combined. You aren't going to take the hash power of securing ETH at $18B and dump it into ETC and ZEC without thinking twice, and if you do you aren't going to be shipping 27,000 GPUS in at a time 2 months before you have to jump from your big pond into those tiny ponds.
-- And if there were, the labor to bring that many machines up, even if you already have the physical and electrical capacity is weeks of work, unless you're employing a very large labor force which you are going to turn around and fire right after they've built your very cost intensive and valuable and hard to secure warehouse full of miners.
Reality is, the industry may be buying one 747 worth over the next several months but they are all getting them a few at at time and constrained by electrical and physical capacity and labor availability, and parts of everything else.
At even low scale these are non-trivial issues, when you start building 10 rigs at a time it is at least 10 times harder, 10 times more likely a part is out, etc etc.