I think people's focus on the threat model from AI corps is wrong. They are not going to "steal your precious SSH/cloud/git credentials" so they can secretly poke through your secret-sauce, botnet your servers or piggy back off your infrastructure, lol of lols. Similarly the possibility of this happening from MCP tool integrations is overblown.
This dangerous misinterpretation of the actual possible threats simply better conceals real risks. What might those real risks be? That is the question. Might they include more subtle forms of nastiness, if anything at all?
I'm of the belief that there will be no nastiness, not really. But if you believe they will be nasty, it at least pays to be rational about the ways in which that might occur, no?
Putting your secrets in any logs is how you get those secrets accidentally or purposefully read by someone you do not want to read it, it doesn't have to be the initial corp, they just need to have bad security or data management for it to leak online or have someone with a lower level of access pivot via logs.
Now multiply that by every SaaS provider you give your plain text credentials in.
The risk isn't from the AI labs. It's from malicious attackers who sneak instructions to coding agents that cause them to steal your data, including your environment variable secrets - or cause them to perform destructive or otherwise harmful actions using the permissions that you've granted to them.