To be clear, I wasn't implying that ev.energy aren't trustworthy. I use the app to optimise my home charging costs, and I think it is great. I simply meant that it is a personal decision about what we are happy for any given app provider to do with our account credentials.
Many people posting in this forum have their journey data recorded in TeslaFi, Tessie and other application services. Indeed, they seem to benefit from it.