What doesn't make sense about it? They don't have the knowledge to use an offline image editor so I'd like to offer them the ability to make very simple changes to an image. Photopea is beyond what they need and would no doubt be equally confusing for them.
What doesn't make sense is your use of the term "offline editor" - it's entirely nonsensical in this context. If they can't use an offline editor, they won't be any better with an online editor. It's like saying you need a 4 door car because you can't drive a 2 door car - it's the same thing with more seats. Photo editing is photo editing regardless of where the software is hosted.
I'm interested to see what hosted options are out there as well.
If you're willing to consider alternatives, take a look at Greenshot. It's a free and open source local program that takes a screenshot which allows you to edit it directly and copy the image to clipboard without saving.
It includes the ability to add text, blur out parts, crop, draw arrows. Just press print screen to capture an image.