Companies like Zoom and many other companies are riding on this wave. But if i launch something during this time that's particularly to leverage this situation, does it count unethical?
A service business that helps established businesses shift more of their work to remote. The demand is enormous right now. Service businesses are labor intensive, they don't scale easily, so during a boom demand time there is never enough specialized labor to go around.
That will taper off after a while. So as you build the business, begin offering other services to your new customers (services that are sustainable after the remote boom fades).
Look for enduring businesses that are unlikely to fail short-term during the economic disaster; businesses that have some forced regulatory-based demand are ideal (certain small to mid-size insurance agencies; some things in real-estate; law firms depending on the segment; and so on).
Lying or misleading is unethical.
Offering a product or a service for someone who willingly wants to pay for the product or service is not unethical at any level.
I see a lot of people thinking they can do the same by "trying to ride the wave", but I think that's short term thinking. If you build a startup just for this situation, you will probably end up building opportunistic business that has not much to do with your own vision.
Instead you should build something that is NOT obviously attractive during this time so as not to jump into a red ocean. You should build something that is unattractive today but powerful in the long run, because no one else would be building this today while you pick up your users one by one. The key is you should focus on building a great product instead of trying to make money during this time.
How is it unethical to ask for compensation for your work or the value you provide? Why would a downturn change this?
If your business provides value/solve a pain point it will do well.