You're right, as [Rijndael pointed out](https://github.com/bitcoin/bitcoin/pull/28130#issuecomment-1665852027) Stamps [baremultisig with many outputs causes this](https://mempool.space/tx/1c61f2d4000e1bc2ce27ec24e4fcbbb376c2bd19641e071403e68d84d48eea8a)

nikicat

bitcoin

What causes rapid UTXO set growth?

I thought it was caused by Stamps. Inscriptions do not bloat the UTXO set very much because they are prunable. Stamps are not prunable because they live in the UTXO set. But they also don't get the witness discount that inscriptions enjoy. 