It's true of about 90% of hotels. It's certainly prevalent enough to suggest that it's a deliberate feature. Or rather, a deliberate lack of feature. Plugging your phone in overnight and having it within reach doesn't seem like a big ask.
The other day we stayed at The Lowry in Salford. It's a swanky kind of hotel. Too swanky for its own good if you ask me. It seems to labour under the impression that convenience is vulgar. Rather than, y'know... convenient. There's no kettle in your room. But they will bring one to your room if you ask. In what way is that better? I mean, it is perfect for all those I think I might want a cup of tea in about 30 minutes moments. But dreadful for all those, Oo, I could do with a cup of tea moments. I know which happens more often in my life.
In The Lowry, there are sockets by the bed. But they're not normal sockets. They have rounded holes. The lamps in the room have corresponding plugs. But nothing you or I own does. That must take a special effort.
Someone somewhere has realised that there were going to be sockets near a bed in a hotel room... and then made a special effort to ensure that their guests can't use them. This is only mildly frustrating. But it is more than mildly fascinating. I would genuinely love to find out why this happens. In what way does it meaningfully benefit the hotel?
Are you a hotel designer. Do you work in the hotel industry? Do you know? Go on... share it with the group...