It’s an excuse, people don’t want to just say they don’t want to do it, so they make an excuse not to, saying it’s ““complicated””. They don’t feel like it or hate it for some irrational reason, possibly a misconception or just hate change.

If you see someone making excuses like this, or even casually making fun of the idea of decentralization and the fediverse, challenge them on it, point out how they are making excuses simply because they don’t want to do it, or say no. Ask them how it is “complicated” and make them give an explanation. 90% of the people I’ve done this with couldn’t come up with one and just acted embarrassed after, because they couldn’t come up with one. It’s a mindless excuse.