It doesn't matter what you or I think of their name change. When you think of Google, do you think of Alphabet? Probably not, but Google changed their corporate name to reflect the entire suite of businesses that run under the umbrella. It's done for corporate structure branding, not to be a catch phrase for the run of the mill consumer.
Entercom has long been associated with traditional AM-FM radio. That's how they started. For years past if you became an Entercom shareholder, you were buying a piece of ownership in a traditional broadcaster. For those companies that plan-on, or have evolved into other forms of business, do you still want future shareholders to be under the impression they're buying just AM-FM radio stations? To me, that's a really bad stereotype if you hope for any growth as a publicly traded company.
Telecoms have changed names to reflect primarily ownership changes. Since the Ma Bell breakup years ago, telecoms have split, merged, and swapped around geographic areas to grow and expand their business model. Then a bigger fish comes along and buys them. The changes you site are for a completely different reason and business model than what we're talking about here.