[saarons]

Historically Americans have been wary of handing out their bank account information because that's all the information needed for a bad actor to issue an ACH debit and pull money from your account. The NACHA guidelines have very strict rules around this and the payment protections are rather strong but it's still a pain to deal with as a consumer. RTP itself is non-reversible so when someone sends you an RTP payment it clears instantly and can never be pulled back as it can with Check and ACH payments.

[dexterdog]

You hand out your bank account information every time you give somebody a check

[zippergz]

And indeed that's one reason (of many) I don't like to write checks. But I'd still argue that the threat model from giving a physical check to someone you know or do business with is different from linking your bank account with some online service like Venmo, where any mass breach or vulnerability might result in a wide array of people now having access to my banking information. And even if my bank covers me in the case of fraud, they don't compensate me for the domino effect problems that can come from having bill payments bounce because the account was emptied.

To be clear I'm not arguing that this is a good system, but as long as it is the system we have, it's wise to limit who you give your banking account information to, regardless of channel.

[rifung]

This is exactly why Donald Knuth doesn't give out checks

https://en.wikipedia.org/wiki/Knuth_reward_check

[r00fus]

Many banks have different values for the check MICR account numbers vs ACH routing purely to avoid easily spoofed ACH requests.

[mgkimsal]

my bank prints out paper checks but they seem to xfer the money through another company. money leaves my bank account, but the checks, when delivered, have a completely different routing and account number. doesn't matter to me, but I had a paper check payment I needed to return and the local branch couldn't help me at all - the floor guy there couldn't even understand my situation. there was an 800 number on the check to call and I explained and they cancelled that check.