Stuff like Rootstock are not layer 2, they are counted as side-chains. Also they are not new, they've been around for a long time and they have not attracted that much attention because they are not hype-based projects and token creation is a scheme that requires hype to survive which means shitplatforms such as ethereum are the choice for token creators to create their useless junk.
Furthermore, Binance Labs recently invested in Babylon, a novel protocol facilitating Bitcoin staking on PoS blockchains. This innovation presents intriguing opportunities for both BTC holders and PoS ecosystems, offering passive income without complex solutions[5].
This is also not new. For years, centralized systems have been trying to take people's bitcoins and promise giving them profit on the coins they gather. Sometimes it is called "stake" and usually they are scams and almost always they turn into a Ponzi scheme.
I would like to know your views on Defi on Bitcoin:
There is NO such thing as DeFi on Bitcoin. There are altcoins that try to stick themselves to Bitcoin but have nothing to do with it and there are also side-chains that are not Bitcoin.
What are your thoughts on storing BTC?
Obvious: not your keys, not your coins.
Do you believe DeFi represents an evolution for Bitcoin?
No. The way these "tokens" are defined, they offer nothing new and have no utility in the real world.
Are you interested in participating in DeFi with your BTC?
No. If I see something pump and dumping on an exchange, I may try to take a quick profit during the pump and sell before the dump begins but that's the only thing I'm interested in.