[rany_]

This is a great idea but I'm a bit concerned about your bandwidth costs and illegal/malicious content being hosted used under your domain.

For the second point, you might want to implement some kind of browser warning similar to what Ngrok does.

[klipitkas]

Thats a fair point, there are some protections in place for abuse already. I will have a look at what ngrok does for browser warnings. Thanks a lot for the suggestions.

[gnfargbl]

Be aware of threat actors, too: you're giving them an easy data exfil route without the hassle and risk of them having to set up their own infrastructure.

Back in the day you could have stood up something like this and worried about abuse later. Unfortunately, now, a decent proportion early users of services like this do tend to be those looking to misuse it.