Lots of people have been scammed through telegram and we all need to be careful and always report any unsolicited PMS on our telegram and the change of username at will on the platform have made it very hard for one to trace scammers because they can easily change the username to whatever they want after scamming you and dellet chat both from they end and your end also.
most peoples were scammed on telegram just for incompetence or superficiality.
In most cases, it should be sufficient to double check the cheater userrname to understand it!
and more,
if someone were offering you a too high ROI or reward or business, maybe it could be a scam!