And there was still a block with 2992 legacy transactions (and zero segwit) in 2020! I searched to find out who that miner was (block 616561) with no success.
https://blockchair.com/bitcoin/block/616561Miner: Unkown (in blockchair and blockchain.com databases)
that block's coinbase's signature script is this:
03716809049f203f5efabe6d6d790aeab57d0c2c6db22acdf312204864aa6e0804d236bcfbf3193f216ac0aef8040000000000000008180052c2d7050000142f70726f68617368696e672e636f6d9b1d02002f
when encoded using UTF8 it contains the name "prohashing.com"