(the link again in case the clickable title doesn’t work on all instances: https://sketchtoy.com)
Have you ever tried to explain something over the internet that doesn’t translate well into words (like a specific route on a map, the layout of a building etc.) and you also can’t find a good picture on the internet showing what exactly you mean? Then just use that site to doodle a sketch. It is free of charge, doesn’t require a registration/verification/whatever or extra software, and the sketches seem to stay online forever.
I have an online roleplaying group that relies solely on chat / texts and this site has helped me numerous times to demonstrate the layout of a tavern, camp or dungeon, to show what in-game items look like and/or how big they are, and to add easy-to-understand visuals to in-game puzzles that would otherwise be hard to describe verbally.
Maybe don’t draw art that you want to own on there?
Do you refuse to throw a piece of paper away because the landfill then owns it? If for any reason the thing you’re trying to convey is private and you want to retain ownership, then obviously don’t use it, and it’s great for you to call that out so others are aware. But to vehemently dismiss some functionality because you don’t find the utility worth the cost is short sighted and childish.
This is a very interesting point that raises a lot of questions; does throwing something in the trash by definition relinquish my ownership? What if I throw something away by accident? Where is the demarcation between my owning something and WM taking ownership? Does it then pass on to whomever owns the landfill, or subsequently whoever might dig it out of the trash? You’ve done gone and wrinkled my brain for the weekend.