It’s literally dilutive. Current shareholders now only own 97.5% of the equity instead of the 100% they owned previously.
They own a smaller portion of outstanding shares, but the shares they own are worth more. Their value doesn't decrease.
Wait, how is this legal? How are current shareholders made whole?
Yes, even if the company raises $10b, the ownership stake and voting power of a share is reduced by 2.5%.
And if that $10b figure is a fixed target, then if the share price continues to fall, the more shares they will need to issue, resulting in even more dilution.