The thing about giving advice is that some people will think it’s obvious, but those aren’t the people who need the advice, it’s the people to whom it wasn’t obvious.
And I don’t see what country/location has to do with this, as I imagine plenty of places use bad materials.
When I read the above comment I couldn't figure out what material they were using other than wood or plastic. I don't think using glass is common, at least I've never seen it in the US.
I was given one by a landlord once because a lot of renters here don't have the money to buy cutting boards so they will just cut directly on the kitchen counters.
I sharpen my own knives so that would be a no from me! I know a lot of people just throw their knives in a drawer or run them through the dishwasher so I guess glass would be fine for those.
I've never understood this. Those things are/were just used to prevent counter-top damage here in the UK (hot pans, things that would stain etc).
We never considered them chopping boards.
Did the USA not get the memo?