About 97% of this 3.99% APY is decaying token emissions. The real fee yield is ~0.11%. It is single-asset, so there is no impermanent loss to drag you below holding.
Real fee/staking yield: 0.11% · token emissions: 97% of the headline.
No impermanent loss here, so you keep the same price exposure either way. The honest number is the ~0.11% of real yield — the rest is fading emissions, not income.
Source: DefiLlama. Verdict is a heuristic over public data, not financial advice.