This is already happening, though I’m not aware of any bipedal pet robots.

Any recommendations?

The Unitree Go1 seems the most promising among the affordable ones.

https://www.unitree.com/en/go1

https://www.youtube.com/watch?v=xdfmhWQyp_8

Would you know whether it’s feasible for hobbyists to make one of these at home by assembling components

Probably, but not at the price point of $2700.

It would probably be $25k-$50k and 1-3 years of development time depending on your skill set.

If you're interested in making one by yourself, you should check out Josh Piper[1]

[1] https://jpieper.com/2020/11/09/mjbots-november-2020-update/

Kind of, see: https://odri.discourse.group/

It is indeed pricey though, IIRC the cost of a Boston Dynamics Spot-like robot came down to around $6-7k. There is still room to drive the price down though.

The ones they used are Robotis OP3, a snip at $14,199 each (https://news.ycombinator.com/item?id=35812475)

Bunch of servos in human shapes is not too expensive, available from about $1000-1500.

I'd recommend XGO-mini2. It just finished it's Kickstarter funding for the version 2, which runs on raspberry pi. (disclaimer, I did contribute to their Kickstarter) and optionally also comes with an arm.

Those are consumer-grade robots, with much better software. (They probably upgraded the motor controllers, too. But those are only crappy because hobby servo technology is stuck in the 1970s.)

Those little OP3 robots are using 250$ each dynamixel digital networked servos.

http://en.robotis.com/shop_en/list.php?ca_id=202020

Yes, those things cost too much due to low demand.

Maybe it's their size or "drunk" motion, but these remind me of toddlers. I would totally get one to just walk around the house doing nothing.