Why is call time on Capitol Hill not considered corrupt? Because the people who write the laws have decreed that it is not.
Are there conditions attached? Yes, our public servants cannot use either official phones or office space from which to solicit “donations” from any person or corporation. There are no geographic restrictions, unlike on citizens who can only vote within their residential districts.
Are there penalties? Indeed. Not collecting a sufficient number of dollars can result in boring committee assignments—e.g. Veterans Affairs
But, let Beto O’Rourke explain it. I’m sure he got all kinds of kudos for being so blunt. Keep in mind this is what is at stake when candidates call for grass roots support.