I don't find any issue with it, either it was done mistakenly or deliberately, or maybe that miner might be testing or showing off to a newbie that the BTC blockchain can not be tricked.
A 1.4 billion company listed on the stock exchange, running at least 18 Exashashes, that's somewhere around ~200k miners with a power draw compared to two nuclear reactors is "showing" to a newbie how the blockchain works! Are you serious?
Making 35 invalid blocks in a day vs 1 if so can this fuck up the block chain speed?
Are they capable of making invalid blocks on such a large scale?
Assuming Mara would mine only invalid blocks it would simply take them off the equation so it would be like a 4.25 % of the hashrate is not mining at all, a drop of 6 blocks per day till the next adjustment but zero income for two weeks for Mara which would trigger the firing of their CEO and even delisting in case of an inquiry that results they did it deliberately.