No, you don't need to store and broadcast hidden magnet links to child porn or other spam (spam + csam = "cspam") if you run a full node.
You don't need to store anything. Just validate and discard.
Utreexo works and can be made compatible with knots.
Rumor is, luke and his team have been working on integrating utreexo and will do a surprise reveal soon.
This may actually have been the plan all along, to force bitcoin core to rebase on knots after enough attention has been captured on the issue. Crazy ass luke knew what he was doing all along...