I haven’t dove into this issue but a new report from Bitmex came out about drivechains. They argue that that there are mining centralization risks to them.
Discussion
This is just incorrect imo.
Miners are profit seeking so if they don’t wish to mine a sidechain block then they lose out on business by miner who will mine the block.
Drivechain includes blind merge mining.
Also, 75% of miners are required for 6 months to steal btc in a sidechain.
One can make the arguement btc mining is already centralised and by allowing for side chains would help making mining more competitive and decentralised.
There’s also projects like stratum 2 are working on making mining less centralised.