My twitter account got flagged as suspicious even though I haven't used it during the past few months and have a long random password. Now they want my mobile n

My twitter account got flagged as suspicious even though I haven't used it during the past few months and have a long random password. Now they want my mobile number to "verify" me in addition to a captcha. It is ridiculous and ovcoiolsly tech companies can't be trusted with personal data of that caliber. I have never used my real name with that twitter account and now they want to know it all, why? Greed is my guess.