Make public SPV node with electrs?

[Geremia]

Can I configure electrs to be a public (port 50002) SPV node?

[nc50lc]

Not directly, but it's possible to be used remotely, see: github.com/romanz/electrs/blob/master/doc/config.md
However, the developer himself doesn't recommend to use it as public Electrum server as noted in its "Usage" part in its 'ReadMe' doc.

There's a note about a fork by Blockstream which would be a good alternative but its database isn't compatible with romanz/electrs
so you will not be able to utilize your existing setup if you decided to use it.

[ABCbits]

I don't know goal, but you may want to use Fulcrum instead. According to benchmark[1], it's better than ElectrumX and Electrs in most aspect.

There's a note about a fork by Blockstream which would be a good alternative but its database isn't compatible with romanz/electrs
so you will not be able to utilize your existing setup if you decided to use it.

Take note that fork have demanding resource requirement.

If you want to run a public server you may be interested in the Blockstream fork of electrs which is better optimized for public usage at the cost of consuming significantly more resources.

Unfortunately Blockstream electrs doesn't mention minimum/recommended hardware, while recommended hardware on mempool.space docs is meant for production usage[2] which probably isn't OP goal.

[1] https://www.sparrowwallet.com/docs/server-performance.html
[2] https://github.com/mempool/mempool/tree/master/production#server-hardware