About 95% of this 3.90% APY is decaying token emissions. The real fee yield is ~0.18%. It is single-asset, so there is no impermanent loss to drag you below holding.
Real fee/staking yield: 0.18% · token emissions: 95% of the headline.
No impermanent loss here, so you keep the same price exposure either way. The honest number is the ~0.18% of real yield — the rest is fading emissions, not income.
Source: DefiLlama. Verdict is a heuristic over public data, not financial advice.