I did not personally find this to be a detractor.

FWIW, I didn't find this to be a bottleneck and it probably helps detect upvote rings.

easy way to reduce bots though

what would you recommend to sign up

The way Hacker News does it.

The dev has to create a fair bit of additional infra if they provide username/password auth

* bot prevention

* same user creating multiple accounts (so now you need some IP tracking or reputation system maybe)

Which is why I think sign in with Google is okay to start with for indie devs.

It's understandable if you as a user don't like it though but shouldn't be a criteria to dismiss Show HN imo

> The dev has to create a fair bit of additional infra if they provide username/password auth

Not until the service gets popular. And having sign in with google as the only option may work against that outcome.

Because of we did not use that way, users can sign up multiple times and can vote their products. But I'm thinking about different limitations in inside. Thank you for feedback!

fwiw, hn definitely deals with that issue too