Unless I’m missing something this is exactly how eBay works. You set a max bid and then it auto bids up to that amount so you can’t get sniped unless they bid higher than your max.

Not that this is perfect either, often it means you can push other people’s bids up to their max even though you have no intention of buying the item. I’ve seen it as a seller and felt bad for the buyers

Yes, almost all online auction sites (or even offline absentee bidding) work this way. You set your maximum price and the auction house bids for you. However, in any case, bidding early gives other bidders information on how much you're willing to bid and allows them to nibble their way up to your max. So bidding late is always advantageous, even when you're setting a max bid.

I've never quite understood why people get so upset about sniping on eBay. Anybody can snipe. That's just the best play. Any time I want to bid on something on eBay, I just set my max bid on the sniping tool instead of on eBay, and then forget about it.