My recollection, from previous discussion on HN, is that the definition of "commercial activity" is far more broad than the open source community would like it to be. And by "open source community", I mean the people that run various foundations and non-profits and things like that.
I don't think that throwing up a virtual tip jar on your Github page counts, but offering paid support would. If you collect telemetry and then sell "usage insights" that would also count as commercial activity. Advertising on the download page is commercial activity. If you have a Patreon account? I actually don't know about that. Anyone know?