I don't know about invariants, but there is absolutely a trend of for-profit companies setting up a business around open source and only later trying to close the doors to lock out the competitors that the Free Software system is explicitly designed to encourage.
> this global issue of companies building businesses off foss and not giving back.
I'll never understand this complaint about not giving back. I can understand if they're asking for free support and coercing you into saying yes, but that's rarely the concern, the concern is always "giving back".
If you release it under GPL, then companies are obliged to abide by the GPL and release their modifications, nothing more or less. If you release it under a less restrictive license then they have no obligations at all, and you presumably chose that license specifically because it made the software easier to use in enterprises.
If giving back matters so very much then you're not really interested in Free Software and you should put those requirements in the license. But you don't get to piggyback on the FOSS movement and then complain when people use your software freely to compete with your for profit.