I didn’t downvote, but there are lots of useful things hobbyists do with this chips. WiFi enabling homebrew CNC machines for example.
To which you may say, just buy a cheaper USB cable. That’s fair, but a homebrew CNC maker could have just bought one of the shelf as well. Part of the fun is making something exactly as you want it, the only trade offs personally imposed.
Adding WiFi to all the things is somewhat of a gimmick, but gimmicks are fun. ESP chips are fast, cheap, and easier to program than alternatives. In many cases for hobbyist use the competitor is a Raspberry Pi which is nearly always overkill.