According to Brian Armstrong, CEO of Coinbase, the SEC wants to restrict US consumers' ability to stake cryptocurrencies.

Staking is Security or NOT (ETH2.0 example)

With SEC's involvement, a debate was started between crypto enthusiasts about SEC's authority. Some individuals have asserted that the staking of cryptocurrencies constitutes a security. because it provides a dollar-based APR. Others, however, point out that as the market price for decentralised cryptocurrency is not defined and can be any amount in any currency, it is not a security in and of itself. ETH2.0 was used as a tool to explain both points.

Rumor or Possibility?

Rumor - Staking is a technical thing. Even if the SEC wanted to, it couldn't outlaw it. Because of this, some individuals think that this assertion is only a rumour.

Possibility - Companies like Coinbase must be pressured; centralised corporations may be controlled. That's why some people are considering this as a mere process to block cryptocurrency development in the US.

CRYPTO Bill 

It is also believed that the SEC will have no say in the upcoming crypto bill of America, so the SEC will be unable to intervene. But no final explanation has been made on this yet; it will be a different topic of discussion.