Are tubs unethical?

No more than glass is. Allow me explain.

Tubs are not cruel or unethical. Tubs are inanimate objects with no feelings, thoughts, or choice in how they are used. Same as glass. It is the people who can be cruel.

There is nothing that restricts a person from using a plastic bin to provide ample space, proper thermal and humidity gradient, security, and even enrichment.
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There is nothing to prevent a glass tank from being barren, cramped, unsanitary, and entirely outside of proper thermogradients/humidity/security for the animal being kept inside it. Such an enclosure is not automatically superior to the former solely because it is made of glass. To suggest otherwise is shows an innocent lack of understanding at best or willful virtue signaling at worst.

Again, It is not the material the enclosure is made of that matters. It is the person behind it. Its entirely noble to want to advocate for the animals well being, but you're not going to get anywhere raging against an inanimate object when it's the human behavior that you actually want to change.

If racks, tubs, and all plastic were entirely outlawed- there would still be crappy keepers. They'd just be keeping crappily in glass instead.

Point is we could do a lot more good if people would place the rage where it actually belongs (at the behavior not the instrument), and cite scientific, species specific, studies that support why they feel that way.

That's how we're going to make real progress instead of just being viewed as a group of people that hopped on the bandwagon of an anthropomorphizing trend- which i'm sure those of us that have been doing this a while have noticed is is quickly and easily dismissed.
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Just trying to help...