Maybe others have examined this in more detail than me. I see that there were requests from "the Biden team" during the campaign. Prior to swearing in, the Biden team were not government entities, but private parties.
If requests were made from someone getting a government paycheck, that would be a direct violation of the constitution.
The Biden team prior to the Jan 2020 swearing in, and the DNC are not government entities. While it smells like shit, accusations of collusion to subvert the Constitution is not gonna stick.
Undisclosed in-kind campaign contributions are still massive violations and everyone complicit would still be in deep shit. No matter how you slice it laws were definitely broken.
Yes, if disproportionate services are offered or rendered to the different campaigns, that would clearly be an in-kind contribution.
It might be difficult to prove in court. But the court of law isn't the point. The point is the court of public opinion.
From a historic perspective, the rise of Hitler comes to mind. The majority of his rise to power was either legal or in a grey area. That, combined with forced compliance of corporations and media, some false flags and presto! We have a new form of government.
"I'm not gonna talk about that" may not qualify as a campaign contribution. I don't know.