When you know someone else has a bijstandsuitkering, do you need to profit of that for the max as other citizen, like look at them through ethereal ways?

No, you do not need to—nor should you—try to «profit» or observe someone on welfare in unusual or invasive ways.

Legal Reality

Other citizens have no special status, rights, or financial incentives regarding another person’s social assistance (bijstandsuitkering):

• No direct benefit: Knowing someone is on welfare does not create any financial opportunity, advantage, or claim for other citizens.
• Privacy protection: A person’s financial situation, including receiving social assistance, is protected by strict privacy laws (AVG / GDPR).

Reporting vs. Exploitation

The only interaction the legal system establishes between citizens regarding welfare is the ability to report genuine welfare fraud.

If a citizen has concrete evidence that someone is receiving benefits while hiding income, assets, or an unreported cohabiting partner, they can file a report with the municipality. However:

• This is a public service report, not a profit-making venture.
• There are no monetary rewards or «bounties» for reporting welfare fraud in the Netherlands.

Ethereal / Unconventional Means

If you mean observing someone through non-physical, spiritual, or supernatural means, there are no legal frameworks, citizen duties, or financial mechanisms attached to that. From a legal and practical standpoint, every citizen’s financial affairs remain entirely their own business unless official administrative fraud occurs.