I have been in the crypto-currencies space since 2016. I've signed up for so many airdrops over the years, Blockchain.com wallet gave me $35 dollars last year. Coinbase isn't my favorite wallet to use but received about $110 from them just recently. I mainly used coinbase to gain the airdrop coins then exchanged it for the currency I use the most. What I would not do for someone new to the space is google "airdrops" or "free bitcoin" and start signing up.
Giving your phone number and email to random airdrops is a horrible idea and in my opinion the easiest way to be susceptible to hacks or stolen crypto-currencies. I try to only engage in airdrops from verified companies. It definitely drops the amount of free crypto you can receive but better safe than sorry.
However I am not a big fan of coinbase. It is a company that has way more reliability than a airdrop from a google search.
