Read the channel descriptions and a pattern shows up fast: several of these creators are not full-time YouTubers at all. Latif runs an Indian restaurant in Cheshire and films in its kitchen. Daniel ShenSmith is a barrister and a qualified mortgage advisor. Sir Nick Faldo is a golf broadcaster.
Jono Jones races mountain bike professionally. For them the channel is the shop window for work that already exists.
Five of the 25 descriptions include a business enquiries address, and several point at a second channel or podcast the same creator runs. That matters practically. These are people with a process for handling a brand approach, not creators you have to reach through a comment reply.
The engagement spread is the other thing worth reading. The average engagement rate across the 25 shown is 3.82% and the median is 3.36%, but the two lowest rates on the list, 2.04% and 2.16%, sit on a 166,000-subscriber recipe channel and a 2.1M-subscriber entertainment channel. Size alone does not explain the gap here.