Because it seems their time has come
These two feel like the most important
ETH scaling with Layer 2, sometimes with privacy: Arbitrum, zkSync, Starknet, Aztec, Polygon Hermez,...
We'll probably see relatively low-value-add L2s like we saw with Alt-L1s last cycle, where most of the TVL is the L2's own token. Those are likely not worth anyone's time.
SmartContract Wallets, or Smart Wallets, or "the future of wallets" because "Seed-Phrases" kill adoption. Currently they're all "missing" something, but they'll get there.
This is Interesting
Aztec, Oasis, Stealth addresses
ZK proofs for privacy: Sismo.io
Liquid Staking: Lido, Rocketpool, and DVT (Obol)
Modular setup & Shared Security: EigenLayer, Celestia, Cosmos, Fuel
Social Experiments: Optimism & Canto
Social Networks: Lens, Farcaster, Nostr
#RealYield: GMX et al.
Regen: with VCM markets first (Klima)
"pure information" assets (RWA) moving on-chain first: VCM, Indices (ie:QQQ is on Gains.Trade), Loyalty points
A new Alt-L1 for no good reasons (written in "move", higher TPS,...)