Secured for me was any kind of application on the entire Polkadot Cloud, at any point in the stack. Contract, Parachain, etc… They all inherit Polkadot’s security one way or another.
Powered were things to me outside of the Polkadot ecosystem, but use the Polkadot technology stack. So dedicated L1s (Avail, Midnight, etc…). Front-ends using the Polkadot-API, SCALE, etc…
Funded, as you said, are any projects which do not fit in these buckets but have been supported by treasury funding.
Perhaps a team could even rock multiple slogans.