Comcast has 189,000 employees who make US salaries. It costs a lot less to dig a trench in Romania than in Seattle.
You can look at the profit margins. 11.3% for Comcast as of June 2022. That tells me they aren't simply collecting the difference between US and Romanian internet prices in profit.
Of course, far be it from me to defend Comcast, but this is basically just the concept of purchasing power parity (PPP)